A Tool's Icon Keeps Disappearing

Yesterday, I downloaded Windows Update MiniTool. It's a portable program where the 7Zip file contains a 32-bit EXE, a 64-bit EXE and an INI file which is apparently some sort of language file. About an hour after I unpacked it, the 64-bit EXE's icon disappeared. I deleted the folder and the shortcut I created, and when I unpacked it again, I left the 32-bit file alone. Eventually, I downloaded that batch file for rebuilding the icon cache, and I thought that that fixed it, but this morning, I discovered that the fix was only temporary. Apparently, there's some other issue causing the icon cache corruption. To rule out some things, I also have IrfanView, which is portable, and I've downloaded several legacy games where I created EXE launchers with Bat To Exe Converter, including icons I made with Greenfish Icon Editor. I've never had any trouble with any of those icons. While I was typing this, I extracted the 32-bit file, just to see what happens. What else can I do to trouble shoot this?

DoItJust said:

I have this problem now and then (also in Win7). For me it helps to delete Iconcache.db in appdata local and then go to properties for the shortcut and change the icon.

I just looked at the batch file, and deleting Iconcache.db is exactly what it does, and I'm not really sure how changing the shortcut's icon would affect the EXE file.

Since the icon in question is still intact, it seems likely that I just needed to fix the icon cache twice to make it stick. I still have no idea what caused the problem, but maybe that's too small an issue to be worth worrying about.