The linux script would not run on Windows, though of course you could manually shift the gnutella file where appropriate.
You can find a Windows installer for FW connection fix here FrostWire connection installers via MediaFire

BTW as a bit of a jest, the FW connection installer for Windows installs a replacement image for FW's main window when it opens. Instead of the usual update advertisement. But of course you will still be prompted to update to FW 5, which is something that is built into the program itself.