[XPCOM] Add several app/msi file types to the executables list (Win).

This errs on the side of caution for what are installer packages, but
people getting conned into thinking this is safe is a bit too common.
They are akin in danger to .exe files in that respect as it installs
software, and should be treated similarly, so, warn about the potential
danger.

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