You've got to rename the file extension. If you're using Windows XP (if you're not you can still do this, but the steps might be a little different, I'm not sure), go to 'Tools', 'Folder Options', 'View' and deselect 'hide file extensions for known types.' Then go to your Inuyasha 112 file, and add .avi to the end of the file name. That ought to work... my computer immediately recognized the file then.
(And if your computer already displays the file extensions, you can skip all the stuff I just said and just rename the file.

)