[joethompson]

You can tell Parallels to never cross-associate OS X or Windows programs with each other via the configuration preferences (http://goput.it/s5h.png). I can't speak for Fusion but I would be surprised if they didn't have a similar setting.

[spicyj]

Yup, Fusion has the same setting: https://s3.amazonaws.com/uploads.hipchat.com/6574/26709/ff8q...

[jmount]

Tried it- it eventually fails on some update.