diff --git a/xpcom/io/nsLocalFileWin.cpp b/xpcom/io/nsLocalFileWin.cpp
index 2b15cb0dd5..103558e483 100644
--- a/xpcom/io/nsLocalFileWin.cpp
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -3037,6 +3037,7 @@ nsLocalFile::IsExecutable(bool* aResult)
       "ins",
       "isp",
       "jar",         // java application bundle
+      "jnlp",        // java web start
       "js",
       "jse",
       "lnk",