[neves]

I thought it would give me total interoperability. That I could edit an movie in a windows app, run it through ffmepg, and go back to editing.

Cygwin is still useful.

[wvenable]

It does but you have to do that from the Windows file system not the Linux one. So from Linux you are accessing /mnt/c/Users/you/somedocument and from Windows it's C:\Users\you\somedocument.

[neves]

But isn't this a new thing? I believe you couldn't do it in the initial versions.

[wvenable]

No, it's always been that way from the initial release. It's literally the only file system interopt that exists.

You're not supposed to access the Linux filesystem from Windows -- it's in a system hidden area of your profile but some people still tried to mess with it with unfortunate consequences.