Stuffit Encoded File

Hi. I've just downloaded a game and the the file came zipped as "Stuffit Encoded File" I used to have Stuffit but I'd uninstalled ages ago. So I got a trial version of it and tried to extract the file but no joy it tells me that its UNKOWN ARCHIVE FORMAT....

Any help with this would be appreciated as I've already checked elsewhere with no luck (I kinda think that the file might be corrupt, ho-hum)

Cheers

PS I also tried to open the file with WINRAR and that didn't work either...that said it was either unknown or corrupt.