[Fyron]

Geo:
Were you trying to resume a broken download from IE/FF? If so, that might not work, because they tend to delete failed download files. If a partial .iso existed somewhere on disk, you should be able to point the torrent at it and get the client to keep whatever pieces of that file pass the hash checks, thus reduce the amount it has to download from the swarm.

You don't necessarily need to save the .torrent file to disk before opening it in a torrent client. You can redownload and restart the same .torrent and resume a partial torrent download (or reseed a completed download), so long as you point it at the existing .iso file (or whatever the torrent contained). Note that most clients save a copy of the .torrent files for future references.

AZ:
Its not so much about resources, as about win32 APIs. If a program is only designed to work with win2k/xp, it probably won't be able to run on win9x no matter what type of system is running the OS. win2k/xp have a lot of system APIs available that were not present in win9x.