Developer website: MIKOZAWA Akira
AmSetFileTypeCMX is a contextual menu plugin, which allows you to change file type, creator and file extension of selected files from the contextual menu. Changing file extension is optional. It executes changing operation using file type, creator and file extension of a file (type file) in the types folder. You just put a file at the types folder to add a new type file.
Mac OS X 10.4 or later