The version is 1.0, Windows Media Stereo Muxer is a command line tool to multiplex left and right file. Open a command line window (Start->Run, enter Cmd) and type WmxMux.exe -i1 "Oldtimers 1080p Left.wmv" -i2 "Oldtimers 1080p Right.wmv" -o "Output.wmv" (adjust the filenames). If...