I would like to associate XPI and JA files (Firefox add-ons and omni.ja, both in ZIP format) with Express Zip, and add the following entries to Windows Explorer's context menu: 1) Compress to "FileName.xpi" 2) Compress to "FileName.ja" Could you please add these options? A better option would be adding a user-defined file extension for a supported format (i.e. Compress to "FileName.user-defined"). Alternatively, could you help me add those two entries using the command-line or a bat file? I'd be grateful. Win 7 32-bit.