Compressed Files

StuffIt

by Smith Micro Software, Inc. · opens 7 file types
Windows
AT A GLANCE
DeveloperSmith Micro Software, Inc.
PlatformsWindows
Opens7 file types
Get it frommy.smithmicro.com
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7 file types verified
Last reviewed Sep 2026

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What is StuffIt?

StuffIt is an archive compression and decompression application originally created by Aladdin Systems and later owned by Smith Micro Software. It introduced the SIT archive format that was the dominant compression standard on classic Mac OS for distributing and compressing files. Modern versions support common formats such as ZIP and 7z in addition to the native SIT format.

Files StuffIt opens

7 formats
Compressed Files
Encoded Files
Misc Files
Developer Files

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SOURCEmy.smithmicro.comofficial site - avoid third-party download portals
PLATFORMSWindows

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programs & formats

Files StuffIt opens most

1.A01Split Multi-volume ARJ compressed file archive (part 3)
2.SITXStuffIt archive file
3.R30Split Multi-volume RAR compressed file archive (part 32)
4.YENCyEnc encoded archive
5.CA_Microsoft Cabinet archive
6.STUFFITTASKStuffIt Scheduler file

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