diff --git a/lib/ui/epub_viewer.dart b/lib/ui/epub_viewer.dart
index 8832ed7..47adb78 100644
--- a/lib/ui/epub_viewer.dart
+++ b/lib/ui/epub_viewer.dart
@@ -33,7 +33,8 @@ Future<void> launchEpubViewer(
     String? epubConfig = await dataBase.getBookState(fileName);
 
     if (openWithExternalApp) {
-      await OpenFile.open(path, linuxByProcess: true);
+      await OpenFile.open(path,
+          linuxByProcess: true, type: "application/epub+zip");
     } else {
       try {
         VocsyEpub.setConfig(
diff --git a/lib/ui/pdf_viewer.dart b/lib/ui/pdf_viewer.dart
index fe0a6d2..0c6c8d0 100644
--- a/lib/ui/pdf_viewer.dart
+++ b/lib/ui/pdf_viewer.dart
@@ -29,7 +29,7 @@ Future<void> launchPdfViewer(
   bool openWithExternalApp = ref.watch(openPdfWithExternalAppProvider);
   if (openWithExternalApp) {
     String path = await getFilePath(fileName);
-    await OpenFile.open(path, linuxByProcess: true);
+    await OpenFile.open(path, linuxByProcess: true, type: "application/pdf");
   } else {
     Navigator.push(context, MaterialPageRoute(builder: (BuildContext context) {
       return PdfView(