Check Super Mario RPG Open World Randomizer Game File CRC (smrpgr)

You likely need a headerless version of the game file that is required. This tool can remove the header for you.
The following is the known valid CRC code for the required game file.
You can use it to verify your legally-obtained game dump.

1B8A0625: Super Mario RPG (SNES)

ROM info for the file you provided: