[Endorphins]

Does anyone know if there is a place or service online where you can convert an Omnigraffle file to Visio? I need to make changes to an Omnigraffle file but don't have access to a Mac at the moment. Ideally I would then want to open the Visio file in Omnigraffle and save it back as an Omnigraffle file again.

I found some places online that let you convert Mac-based program files to PC-based program files (like Keynote files to Power Point) but not for Omnigraffle.

Does anyone know if it's possible to do online?