This has been answered many times... I wont bother writing everything so just check this very complete post.
I'd recommend MSCEInf to unpack and Pocket PC Installation Creator to create. WinCE cab Manager can modify cabs but it's not free.
You should consider changing antivirus. AFAIK every file in this thread is clean.
The shortcut and scripts in the cab look for specific install paths (in English system localization). My scripts were tailor...
The HD mini has an odd screen resolution (in fact it seems to be the only phone with that screen size... HVGA is a stupid res between QVGA and VGA)... This alone makes it a poor device. Every informed user should have known it was a bad product be...