I commented the the first line of the batch to show the error: 9:32:44,74 C:\projekte\sega development\midinotes > python midi2dmf.py -v "C:\projekte\sega development\midinotes\OVER.MID" "C:\projekte\sega development\midinotes\OVER.dmf"
python: can't open file 'C:\\projekte\\sega development\\midinotes\\midi2dmf.py': [Errno 2] No such file or directory
The call is not executed in the correct directory. This isn't an issue of the python installation, it is wrong assumption what is the current working directory.