Le format SIT, c'est un format de compression Mac (le "ZIP" du Mac).
"StuffIt archive
The standard archive format on the Macintosh developed by Aladdin Systems, Inc., and most often used with Aladdin?s commercial and freeware products StuffIt Deluxe and Aladdin Expander. StuffIt archives usually have the extension .sit or .sea (self-extracting). Either type is expanded on the PC using Aladdin Expander, version 1.0, 2.0, or 5.x
Aladdin DropStuff 5.0: Aladdin Systems, Inc."
Cf Aladin Expander (freeware), http://www.aladdinsys.com
Dans le .SIT, il peut y avoir "n'importe quoi" : du Word, une image, ...