Well as per my research over the internet, WMV is windows media file and so MeGUI dont supports it

Even for avi it uses avisynth and whn avisynth dont work you need to use the file indexer option in tools menu to import it or use mkvmerge to make it mkv

As per HB I still think its a bug in HB as its showing same on my PC

If your PC version is working fine, then I will say zip your PC version from c drive and upload it, download in RDA and try it that way

Or use a nightly or stable version