Any application can potentially create/use the .IFO file extension, as the extension is an abbreviation of 'information' thus can contain any kind of data. Because of this, it is not possible to provide detailed information on this extension.

However if you are looking for clues as to which application created the file, you can sometimes use a standard text editor to open the file and scan through the contents to look for clues. Remember, don't save the file once you have finished as you'll convert the unknown format to a text file!