Hi Bob, and thanks - I’d already seen you post this about 3 or 4 replies back, but it doesn’t cover the XP compressed-folders operation.
I did take a look in file-types-associations, and I was right, this is handled thru RunDLL with some odd-looking parameters as default. And I don’t want to mess with those if I don’t know what I’m doing.
Oh, well, Exporer-shell scanning (with Ashquick) will do the trick manually, plus (hopefully) the Standard Shield is keeping an eye on things if I open the Zip or whatever.