I can't open my zip archive

The most common problems with zip archives occur during file transfer. If you want to send a zip archive (ie, any file created by ZipIt) then your terminal software should be set to send in Binary, but not MacBinary mode.

In ZTerm, this can be achieved by choosing Binary from the Transfer Convert submenu in the File menu. Similarly, when receiving a zip archive (ie, a file that ends in '.zip', created by PKZip or some similar program, including ZipIt) you should be in either Binary or MacBinary mode, but not text mode.

Please note that if you are able to open the archive, but the files you unzip don't appear to be valid, you should look here.