Is WMV possible too? Some clients can’t install quicktime and apparently have Windows 95 machines. 
I’m not sure, we’d need to look into licensing WMV.
Would they be willing to install an MPEG-4 codec?
They can almost certainly read MPEG-1 files, and we could add support for those, but it’s probably not satisfactory. Please let me know.
They aren’t willing to do anything. That’s why they ask for WMVs. 
These are corporate clients who probably can’t even install Quicktime on their machines without putting in a support ticket.
I think it’s VC-1 under the hood. If it’s a cheap license we wouldn’t mind it being an add-on.