Edit to my previous comment:
We're still fixing a small issue that can cause the editor to think the exported file is invalid. This will come asap together with the promised detailed info on how to use the exporter.
@Module Once the aforementioned issue is solved, the exporter should give no more trouble. I do suggest using Maya since the provided exporter supports an easy conversion to the required GR2 format

Also, our example files on the wiki are Maya as well.
Sincerely,
Kevin