File extension too long

Try checking the disk for errors? Maybe you somehow created an erroneous file name (which the OS shouldn't allow in the first place, but when you mention "spell" perhaps you bypassed some sanity check).

Boot to a Linux CD (such as System Rescue CD) and mount the disk with that, try to remove the file that way.

@Spaz: Wow, didn't realize there was a special syntax for "extended length!"