diff --git a/xpcom/io/nsLocalFileWin.cpp b/xpcom/io/nsLocalFileWin.cpp
index 5210885dd9..8b063802ed 100644
--- a/xpcom/io/nsLocalFileWin.cpp
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -3020,6 +3020,8 @@ nsLocalFile::IsExecutable(bool* aResult)
       "air",         // Adobe AIR installer
       "app",         // executable application
       "application", // from bug 348763
+      "appx",
+      "appxbundle",
       "asp",
       "bas",
       "bat",
@@ -3062,6 +3064,8 @@ nsLocalFile::IsExecutable(bool* aResult)
       "msh",         // Microsoft Shell
       "mshxml",      // Microsoft Shell
       "msi",
+      "msix",
+      "msixbundle",
       "msp",
       "mst",
       "ops",         // Office Profile Settings