FIX FOR GAME ATTACHMENTS/DOWNLOADS/OTHER ERRORS
1) Install then open internalz, gointo preferences, scroll to RESGISTER AS FILE HANDLER select YES.
2) find file in internalz, long press, select INFO.
3) at top of INFO page, tap the area for the name, all the way to right either change extension or if no extension chanfe it to .ipk for apps (others I haven't tried but .ppt for iwerpoint, .pdf, etc) it'll ask if you're sure yes,no...pick yes.
4) go back to list containing your file, long press select open...if should install