On my FileType class, I need to support additional file type detections.
This site contains some related info:
http://wangrui.wordpress.com/2007/06/19/file-signatures-tableThe additional types I need to support are:
AVI - Windows AVI files
TXT - TXT files
PPT - Powerpoint
The Powerpoint detection for PPTX, for the XML version, is already in place. The reference here is for previous Powerpoint versions.
Any help on the proper signature to use on those three would be welcome.