Originally Posted by Developer of WMRecorder

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...Youtube is one of the most recorded site with WM
Recorder.

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, please download the upgrade WMR 11.3