I'm seeing this behaviour on a few machines, my vmware session being one
of them.

I'm testing application icons in folders. On my start menu I have a zen
app folder with subfolders and apps in them.

I will occasionally see Foldername.{763370C4-268e-4308-A60C-D8DA0342BE32}

I don't know if that number stays constant.

It looks like a GUID but it doesn't match up to any of the applications
in the folder.

Any idea why it does that?