I'm trying to attach a zip file that I created using the New Compressed (zipped) Folder feature of Windows XP to my support request. On the New Support Request Page, I clicked Browse and in the Choose File dialog that came up, I navigated to the zip file. Then I clicked Open and all that happened is that the dialog navigated to the contents of the zip file. I couldn't attach it, although I could attach ordinary files.
I tried changing the extension of the zip file to something else, but that doesn't seem to help.
In order to work around the problem I created the archive with WinZip and uploaded that.
IIRC, there are two buttons: one for navigate/select, and one to do the actual upload.
HTH