Just a bit of a nudge, but if you use the built-in zip utility in Windows, more people can use your macro right out of box, so to speak. (Right click File or Folder > “Send to” > “Compressed (zipped) folder”.)
If the forum don’t accept .ZIP files, just rename it to .PIZ (that usually works for me).
I cannot remember if this works in XP, but Windows 7 and 8 has it built right in. 