diff --git a/app/src/main/java/org/linphone/ui/fileviewer/FileViewerActivity.kt b/app/src/main/java/org/linphone/ui/fileviewer/FileViewerActivity.kt
index 7b856d775..0e95f8a0b 100644
--- a/app/src/main/java/org/linphone/ui/fileviewer/FileViewerActivity.kt
+++ b/app/src/main/java/org/linphone/ui/fileviewer/FileViewerActivity.kt
@@ -84,6 +84,14 @@ class FileViewerActivity : GenericActivity() {
             finish()
         }
 
+        viewModel.showRedToastEvent.observe(this) {
+            it.consume { pair ->
+                val message = getString(pair.first)
+                val icon = pair.second
+                showRedToast(message, icon)
+            }
+        }
+
         viewModel.fileReadyEvent.observe(this) {
             it.consume { done ->
                 if (!done) {
diff --git a/app/src/main/java/org/linphone/ui/fileviewer/viewmodel/FileViewModel.kt b/app/src/main/java/org/linphone/ui/fileviewer/viewmodel/FileViewModel.kt
index 850679cb9..31e4e6266 100644
--- a/app/src/main/java/org/linphone/ui/fileviewer/viewmodel/FileViewModel.kt
+++ b/app/src/main/java/org/linphone/ui/fileviewer/viewmodel/FileViewModel.kt
@@ -138,6 +138,10 @@ class FileViewModel
                 Log.d("$TAG File [$file] seems to be plain text")
                 loadPlainText()
             }
+            FileUtils.MimeType.Unknown -> {
+                Log.w("$TAG Unknown MIME type for file at [$file], opening it as plain text")
+                loadPlainText()
+            }
             else -> {
                 Log.e("$TAG Unexpected MIME type [$mimeType] for file at [$file] with extension [$extension]")
                 fileReadyEvent.value = Event(false)
@@ -333,6 +337,14 @@ class FileViewModel
                     // TODO FIXME : improve performances !
                 } catch (e: Exception) {
                     Log.e("$TAG Exception trying to read file [$filePath] as text: $e")
+                    showRedToastEvent.postValue(
+                        Event(
+                            Pair(
+                                R.string.conversation_file_cant_be_opened_error_toast,
+                                R.drawable.warning_circle
+                            )
+                        )
+                    )
                 }
             }
         }
diff --git a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationDocumentsListFragment.kt b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationDocumentsListFragment.kt
index bf6b4cc96..d01a7e959 100644
--- a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationDocumentsListFragment.kt
+++ b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationDocumentsListFragment.kt
@@ -31,14 +31,14 @@ import androidx.lifecycle.ViewModelProvider
 import androidx.navigation.fragment.findNavController
 import androidx.navigation.fragment.navArgs
 import androidx.recyclerview.widget.LinearLayoutManager
-import org.linphone.R
 import org.linphone.core.tools.Log
 import org.linphone.databinding.ChatDocumentsFragmentBinding
-import org.linphone.ui.GenericActivity
 import org.linphone.ui.main.chat.adapter.ConversationsFilesAdapter
 import org.linphone.ui.main.chat.model.FileModel
 import org.linphone.ui.main.chat.viewmodel.ConversationDocumentsListViewModel
 import org.linphone.ui.main.fragment.SlidingPaneChildFragment
+import org.linphone.utils.ConfirmationDialogModel
+import org.linphone.utils.DialogUtils
 import org.linphone.utils.Event
 import org.linphone.utils.FileUtils
 import org.linphone.utils.RecyclerViewHeaderDecoration
@@ -149,10 +149,10 @@ class ConversationDocumentsListFragment : SlidingPaneChildFragment() {
             putBoolean("isEncrypted", fileModel.isEncrypted)
             putLong("timestamp", fileModel.fileCreationTimestamp)
             putString("originalPath", fileModel.originalPath)
+            putBoolean("isMedia", false)
         }
         when (FileUtils.getMimeType(mime)) {
             FileUtils.MimeType.Pdf, FileUtils.MimeType.PlainText -> {
-                bundle.putBoolean("isMedia", false)
                 sharedViewModel.displayFileEvent.value = Event(bundle)
             }
             else -> {
@@ -165,13 +165,38 @@ class ConversationDocumentsListFragment : SlidingPaneChildFragment() {
                     requireContext().startActivity(intent)
                 } catch (anfe: ActivityNotFoundException) {
                     Log.e("$TAG Can't open file [$path] in third party app: $anfe")
-                    val message = getString(
-                        R.string.conversation_no_app_registered_to_handle_content_type_error_toast
-                    )
-                    val icon = R.drawable.file
-                    (requireActivity() as GenericActivity).showRedToast(message, icon)
+                    showOpenAsPlainTextDialog(bundle)
                 }
             }
         }
     }
+
+    private fun showOpenAsPlainTextDialog(bundle: Bundle) {
+        val model = ConfirmationDialogModel()
+        val dialog = DialogUtils.getOpenAsPlainTextDialog(
+            requireActivity(),
+            model
+        )
+
+        model.dismissEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                dialog.dismiss()
+            }
+        }
+
+        model.cancelEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                dialog.dismiss()
+            }
+        }
+
+        model.confirmEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                sharedViewModel.displayFileEvent.value = Event(bundle)
+                dialog.dismiss()
+            }
+        }
+
+        dialog.show()
+    }
 }
diff --git a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationFragment.kt b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationFragment.kt
index 4007cf6cc..dc477869f 100644
--- a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationFragment.kt
+++ b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationFragment.kt
@@ -69,7 +69,6 @@ import org.linphone.core.tools.Log
 import org.linphone.databinding.ChatConversationFragmentBinding
 import org.linphone.databinding.ChatConversationPopupMenuBinding
 import org.linphone.ui.GenericActivity
-import org.linphone.ui.main.MainActivity
 import org.linphone.ui.main.chat.ConversationScrollListener
 import org.linphone.ui.main.chat.adapter.ConversationEventAdapter
 import org.linphone.ui.main.chat.adapter.MessageBottomSheetAdapter
@@ -1093,7 +1092,11 @@ open class ConversationFragment : SlidingPaneChildFragment() {
         val extension = FileUtils.getExtensionFromFileName(path)
         val mime = FileUtils.getMimeTypeFromExtension(extension)
         val mimeType = FileUtils.getMimeType(mime)
-        Log.i("$TAG Extension for file [$path] is [$extension], associated MIME type is [$mimeType]")
+        if (mimeType == FileUtils.MimeType.Unknown && extension.contains("/")) {
+            Log.w("$TAG Slash character found in 'extension' [$extension] deduced from file path [$path]; MIME type will be Unknown")
+        } else {
+            Log.i("$TAG Extension for file [$path] is [$extension], associated MIME type is [$mimeType]")
+        }
 
         val bundle = Bundle()
         bundle.apply {
@@ -1114,7 +1117,8 @@ open class ConversationFragment : SlidingPaneChildFragment() {
                 sharedViewModel.displayFileEvent.value = Event(bundle)
             }
             else -> {
-                showOpenOrExportFileDialog(path, mime)
+                bundle.putBoolean("isMedia", false)
+                showOpenOrExportFileDialog(path, mime, bundle)
             }
         }
     }
@@ -1413,7 +1417,7 @@ open class ConversationFragment : SlidingPaneChildFragment() {
         bottomSheetDialog = unsafeConversationDetailsBottomSheet
     }
 
-    private fun showOpenOrExportFileDialog(path: String, mime: String) {
+    private fun showOpenOrExportFileDialog(path: String, mime: String, bundle: Bundle) {
         val model = ConfirmationDialogModel()
         val dialog = DialogUtils.getOpenOrExportFileDialog(
             requireActivity(),
@@ -1428,7 +1432,7 @@ open class ConversationFragment : SlidingPaneChildFragment() {
 
         model.cancelEvent.observe(viewLifecycleOwner) {
             it.consume {
-                openFileInAnotherApp(path, mime)
+                openFileInAnotherApp(path, mime, bundle)
                 dialog.dismiss()
             }
         }
@@ -1466,7 +1470,7 @@ open class ConversationFragment : SlidingPaneChildFragment() {
         dialog.show()
     }
 
-    private fun openFileInAnotherApp(path: String, mime: String) {
+    private fun openFileInAnotherApp(path: String, mime: String, bundle: Bundle) {
         val intent = Intent(Intent.ACTION_VIEW)
         val contentUri: Uri =
             FileUtils.getPublicFilePath(requireContext(), path)
@@ -1477,14 +1481,39 @@ open class ConversationFragment : SlidingPaneChildFragment() {
             requireContext().startActivity(intent)
         } catch (anfe: ActivityNotFoundException) {
             Log.e("$TAG Can't open file [$path] in third party app: $anfe")
-            val message = getString(
-                R.string.conversation_no_app_registered_to_handle_content_type_error_toast
-            )
-            val icon = R.drawable.file
-            (requireActivity() as MainActivity).showRedToast(message, icon)
+            showOpenAsPlainTextDialog(bundle)
         }
     }
 
+    private fun showOpenAsPlainTextDialog(bundle: Bundle) {
+        val model = ConfirmationDialogModel()
+        val dialog = DialogUtils.getOpenAsPlainTextDialog(
+            requireActivity(),
+            model
+        )
+
+        model.dismissEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                dialog.dismiss()
+            }
+        }
+
+        model.cancelEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                dialog.dismiss()
+            }
+        }
+
+        model.confirmEvent.observe(viewLifecycleOwner) {
+            it.consume {
+                sharedViewModel.displayFileEvent.value = Event(bundle)
+                dialog.dismiss()
+            }
+        }
+
+        dialog.show()
+    }
+
     private fun exportFile(path: String, mime: String) {
         filePathToExport = path
 
diff --git a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationMediaListFragment.kt b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationMediaListFragment.kt
index 4ae642f08..e8d0d1f68 100644
--- a/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationMediaListFragment.kt
+++ b/app/src/main/java/org/linphone/ui/main/chat/fragment/ConversationMediaListFragment.kt
@@ -178,10 +178,10 @@ class ConversationMediaListFragment : SlidingPaneChildFragment() {
             putBoolean("isEncrypted", fileModel.isEncrypted)
             putLong("timestamp", fileModel.fileCreationTimestamp)
             putString("originalPath", fileModel.originalPath)
+            putBoolean("isMedia", true)
         }
         when (FileUtils.getMimeType(mime)) {
             FileUtils.MimeType.Image, FileUtils.MimeType.Video, FileUtils.MimeType.Audio -> {
-                bundle.putBoolean("isMedia", true)
                 sharedViewModel.displayFileEvent.value = Event(bundle)
             }
             else -> {
diff --git a/app/src/main/java/org/linphone/utils/DialogUtils.kt b/app/src/main/java/org/linphone/utils/DialogUtils.kt
index 7e9a751d3..4dc0843cb 100644
--- a/app/src/main/java/org/linphone/utils/DialogUtils.kt
+++ b/app/src/main/java/org/linphone/utils/DialogUtils.kt
@@ -47,6 +47,7 @@ import org.linphone.databinding.DialogKickFromConferenceBinding
 import org.linphone.databinding.DialogManageAccountInternationalPrefixHelpBinding
 import org.linphone.databinding.DialogMergeCallsIntoConferenceBinding
 import org.linphone.databinding.DialogOpenExportFileBinding
+import org.linphone.databinding.DialogOpenPlainTextBinding
 import org.linphone.databinding.DialogPickNumberOrAddressBinding
 import org.linphone.databinding.DialogRemoveAccountBinding
 import org.linphone.databinding.DialogRemoveAllCallLogsBinding
@@ -343,6 +344,22 @@ class DialogUtils {
             return getDialog(context, binding)
         }
 
+        @UiThread
+        fun getOpenAsPlainTextDialog(
+            context: Context,
+            viewModel: ConfirmationDialogModel
+        ): Dialog {
+            val binding: DialogOpenPlainTextBinding = DataBindingUtil.inflate(
+                LayoutInflater.from(context),
+                R.layout.dialog_open_plain_text,
+                null,
+                false
+            )
+            binding.viewModel = viewModel
+
+            return getDialog(context, binding)
+        }
+
         @UiThread
         fun getUpdateAvailableDialog(
             context: Context,
diff --git a/app/src/main/java/org/linphone/utils/FileUtils.kt b/app/src/main/java/org/linphone/utils/FileUtils.kt
index 6039aab8f..79c9796ea 100644
--- a/app/src/main/java/org/linphone/utils/FileUtils.kt
+++ b/app/src/main/java/org/linphone/utils/FileUtils.kt
@@ -115,8 +115,9 @@ class FileUtils {
                 type.endsWith("/log") -> MimeType.PlainText
                 type.startsWith("video/") -> MimeType.Video
                 type.startsWith("audio/") -> MimeType.Audio
-                type.startsWith("application/pdf") -> MimeType.Pdf
-                type.startsWith("application/json") -> MimeType.PlainText
+                type == "application/pdf" -> MimeType.Pdf
+                type == "application/json" -> MimeType.PlainText
+                type == "application/xml" -> MimeType.PlainText
                 else -> MimeType.Unknown
             }
             Log.d("$TAG MIME type for [$type] is [$mime]")
diff --git a/app/src/main/res/layout/dialog_open_plain_text.xml b/app/src/main/res/layout/dialog_open_plain_text.xml
new file mode 100644
index 000000000..51d32173d
--- /dev/null
+++ b/app/src/main/res/layout/dialog_open_plain_text.xml
@@ -0,0 +1,103 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <data>
+        <import type="android.view.View" />
+        <variable
+            name="viewModel"
+            type="org.linphone.utils.ConfirmationDialogModel" />
+    </data>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:onClick="@{() -> viewModel.dismiss()}"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <ImageView
+            android:id="@+id/dialog_background"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_marginStart="12dp"
+            android:layout_marginEnd="12dp"
+            android:layout_marginBottom="2dp"
+            android:src="@drawable/shape_dialog_background"
+            android:contentDescription="@null"
+            app:layout_constraintWidth_max="@dimen/dialog_max_width"
+            app:layout_constraintBottom_toBottomOf="@id/anchor"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="@id/title" />
+
+        <androidx.appcompat.widget.AppCompatTextView
+            style="@style/section_header_style"
+            android:id="@+id/title"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="15dp"
+            android:paddingTop="@dimen/dialog_top_bottom_margin"
+            android:text="@string/conversation_no_app_registered_to_handle_content_type_dialog_title"
+            app:layout_constraintVertical_chainStyle="packed"
+            app:layout_constraintBottom_toTopOf="@id/message"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <androidx.appcompat.widget.AppCompatTextView
+            style="@style/default_text_style"
+            android:id="@+id/message"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="15dp"
+            android:layout_marginEnd="15dp"
+            android:layout_marginTop="10dp"
+            android:text="@string/conversation_no_app_registered_to_handle_content_type_dialog_message"
+            android:textSize="14sp"
+            app:layout_constraintBottom_toTopOf="@id/cancel"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toBottomOf="@id/title" />
+
+        <androidx.appcompat.widget.AppCompatTextView
+            android:onClick="@{() -> viewModel.cancel()}"
+            style="@style/secondary_button_label_style"
+            android:id="@+id/cancel"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="32dp"
+            android:layout_marginStart="15dp"
+            android:layout_marginEnd="15dp"
+            android:text="@string/dialog_cancel"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toBottomOf="@id/message"
+            app:layout_constraintBottom_toTopOf="@id/confirm"/>
+
+        <androidx.appcompat.widget.AppCompatTextView
+            android:onClick="@{() -> viewModel.confirm()}"
+            style="@style/primary_button_label_style"
+            android:id="@+id/confirm"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:layout_marginStart="15dp"
+            android:layout_marginEnd="15dp"
+            android:text="@string/conversation_dialog_open_plain_text_label"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintTop_toBottomOf="@id/cancel"
+            app:layout_constraintBottom_toTopOf="@id/anchor"/>
+
+        <View
+            android:id="@+id/anchor"
+            android:layout_width="wrap_content"
+            android:layout_height="@dimen/dialog_top_bottom_margin"
+            app:layout_constraintTop_toBottomOf="@id/confirm"
+            app:layout_constraintStart_toStartOf="@id/dialog_background"
+            app:layout_constraintEnd_toEndOf="@id/dialog_background"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</layout>
\ No newline at end of file
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index 2b9baa643..4d08bc087 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -463,6 +463,9 @@
     <string name="conversation_dialog_open_or_export_file_message">&appName; ne peut ouvrir ce fichier.\n\nVoulez-vous l\'ouvrir dans une autre app (si possible), ou le sauvegarder sur votre appareil ?</string>
     <string name="conversation_dialog_open_file_label">Ouvrir le fichier</string>
     <string name="conversation_dialog_export_file_label">Sauvegarder le fichier</string>
+    <string name="conversation_no_app_registered_to_handle_content_type_dialog_title">Ouvrir comme texte brut ?</string>
+    <string name="conversation_no_app_registered_to_handle_content_type_dialog_message">Aucune application trouvée pour lire ce fichier.\n\nVoulez-vous essayer de l\'ouvrir en tant que texte brut ?</string>
+    <string name="conversation_dialog_open_plain_text_label">Ouvrir comme texte brut</string>
     <string name="conversation_failed_to_play_voice_recording_message">Impossible de lire le message vocal !</string>
     <string name="conversation_message_deleted_toast">Message supprimé</string>
     <string name="conversation_failed_to_create_toast">Échec de création de la conversation !</string>
@@ -483,6 +486,7 @@
     <string name="conversation_take_picture_label">Prendre une photo</string>
     <string name="conversation_pick_file_from_gallery_label">Ouvrir la gallerie</string>
     <string name="conversation_pick_any_file_label">Choisir un fichier</string>
+    <string name="conversation_file_cant_be_opened_error_toast">Impossible d\'ouvrir le fichier!</string>
 
     <string name="conversation_info_participants_list_title">Participants (%s)</string>
     <string name="conversation_info_add_participants_label">Ajouter des participants</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 264693b85..95a788122 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -503,6 +503,9 @@
     <string name="conversation_dialog_open_or_export_file_message">&appName; can\'t open this file.\n\nDo you want to open it in another app (if possible), or export it on your device?</string>
     <string name="conversation_dialog_open_file_label">Open file</string>
     <string name="conversation_dialog_export_file_label">Export file</string>
+    <string name="conversation_no_app_registered_to_handle_content_type_dialog_title">Open as plain text?</string>
+    <string name="conversation_no_app_registered_to_handle_content_type_dialog_message">No app found to open this kind of file.\n\nWould you like to try opening it as plain text?</string>
+    <string name="conversation_dialog_open_plain_text_label">Open as plain text</string>
     <string name="conversation_failed_to_play_voice_recording_message">Voice recording cannot be played!</string>
     <string name="conversation_message_deleted_toast">Message has been deleted</string>
     <string name="conversation_failed_to_create_toast">Failed to create conversation!</string>
@@ -523,6 +526,7 @@
     <string name="conversation_take_picture_label">Take picture</string>
     <string name="conversation_pick_file_from_gallery_label">Open gallery</string>
     <string name="conversation_pick_any_file_label">Pick file</string>
+    <string name="conversation_file_cant_be_opened_error_toast">File can\'t be opened!</string>
 
     <string name="conversation_info_participants_list_title">Group members (%s)</string>
     <string name="conversation_info_add_participants_label">Add participants</string>