New
#111
have you spotted the right-click context menu entry to perform this?
So I know this because since changing from Vista to Windows 7 I noticed that native wmc capture changed from DVRMS to .wtv . I had already had all the trouble of finding a DVRMS converter (i convert to WAV only for audio stuff) and searched as you are doing but one day I just happend to right click on a .wtv file in Windows 7 and there is a context menu entry just for the purpose of converting .wtv to DVRMS - no external programs needed.
Rather late a solution for you I suspect but I hope it helps someone else.
So to recap: right-click on your .wtv file in Windows 7 and you'll see just under "Add to Windows Media Player list" an entry labelled "Convert to .dvr-ms Format".