Sounds like you downloaded the wrong one.
Choose the one that is called FrostWire Windows ConnectFix June 2012.zip from view folder: FrostWire Connect Fixes - ifile.it
I presumed most people would guess the OSX one is for Mac users only. I renamed the Windows one from FrostWire Gnutella ConnectFix June 2012.zip. I've double-checked and the one named above is the Windows one. AFAIK it should be 64-bit Windows 7 compatible. I've run it on my Windows 7.

On Windows, the MacOSX connection fix will look like a folder and inside is another folder called Contents. This is how most MacOSX applications are designed, so it includes most of the support files within the program package instead of them being installed all over the system like on Windows. To uninstall programs on MacOSX is often as simple as trashing the program package. But on MacOSX it looks like a file not a folder.