diff --git a/src/GUI.cpp b/src/GUI.cpp
index 050b39645..8cb46d78e 100644
--- a/src/GUI.cpp
+++ b/src/GUI.cpp
@@ -439,7 +439,7 @@ void GUI::on_actionExit_triggered() {
 }
 
 void GUI::previewFile(QString filePath) {
-  QDesktopServices::openUrl(filePath);
+  QDesktopServices::openUrl(QString("file://")+filePath);
 }
 
 unsigned int GUI::getCurrentTabIndex() const{