Originally Posted by developer of WM Recorder

I've seen this issue reported occasionally over the past 3 years. It seems to be related to computers that use languages other than English although many people from Europe and South America use the program. WM Recorder is UNICODE compatible but...

See if you can setup the recording folder on the C drive. Check also the
registry key

HKEY_CURRENT_USER\Software\WMR11\Settings

The recording folder name is under "My Recordings"

Also, download the upgrade WMR 11.3