A file tool mark Library

Adding to Hogfly's idea about an application tool mark library and looking at my last post I think it might be interesting to have a File type tool mark library. What if you were able to look at a file and determine what program was used to create it? In my last blog I showed how a doc file that had been originally created in word once save in Word Perfect changed. Now how could this be important? Well if that file was found on a pc that did not have Word Perfect Installed then you can show that the file was not maintained there.

Thoughts/Comments/Questions??