You don't have to type in cmd.exe

Just "drag and drop" in main2raw.exe.
It works for me.

There is other way to extract the firmware.

1. Get any program that can extract firmware to .raw and "sefstool4.exe"
2. Make the new folder to put the programs like MAIN2RAW and SEFStool4.
3. Copy the cmd.exe from c:/windows/system32/ to the new folder.
4. Convert FS to .raw
5. Open cmd.exe and type "sefstool4.exe <FS name>.raw" then press enter.
6. You got the extracted FS!