diff --git a/src/cheogram/java/com/cheogram/android/WebxdcPage.java b/src/cheogram/java/com/cheogram/android/WebxdcPage.java
index 2f22b40d88774ea2b9e58688bbc1a1a455ff341c..499e0a5b7971d4db46659f5c8b9a77c1c8272634 100644
--- a/src/cheogram/java/com/cheogram/android/WebxdcPage.java
+++ b/src/cheogram/java/com/cheogram/android/WebxdcPage.java
@@ -471,7 +471,11 @@ public class WebxdcPage implements ConversationPage {
 				intent.setAction(ConversationsActivity.ACTION_VIEW_CONVERSATION);
 				intent.putExtra(ConversationsActivity.EXTRA_CONVERSATION, ((Conversation) source.getConversation()).getUuid());
 				if (text != null) intent.putExtra(Intent.EXTRA_TEXT, text);
-				if (data != null) intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("data:application/octet-stream;base64," + data));
+				if (data != null) {
+					var mimeType = name == null ? null : MimeUtils.guessFromPath(name);
+					if (mimeType == null) mimeType = "application/octet-stream";
+					intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("data:" + mimeType + ";base64," + data));
+				}
 				activity.get().startActivity(intent);
 				return null;
 			} catch (Exception e) {