Virtual EXOS seems quite popular here and I wanted to let everyone know that the Virtual EXOS images for v21.1 have just been uploaded to our GitHub repository. https://github.com/extremenetworks/Virtual_EXOS
Hi Darren, I just added a link to the release notes to my original post... should have included that in the beginning.
If you're asking specifically about the file names, it's just a naming convention change.