.SIT File Extension
File TypeStuffIt Archive
What is a SIT file?
Compressed file "stuffed" by Smith Micro StuffIt software; common file compression format used on Macintosh systems; originally Mac-only, now cross-platform, meaning SIT files can be created and opened on both Macintosh and Windows platforms.
Stuffit was previously developed by Allume Systems (formerly Aladdin Systems), but is now developed and distributed by Smith Micro.