Open SIT files

  • Full name
    StuffIt Expander Archive Format
  • Developer
    Smith Micro
  • Popularity
Have you encountered a problem with a SIT file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a SIT file here. In the further part of this page we have added a list of programs that should open your SIT file. It is enough you choose a proper application for your operating system, download and install it.

What is SIT file?

SIT is the archive format that is especially at home on the Apple platform. SIT is a commercial format of the software Stuffit for archiving and compressing data. The format comes originally from the Apple Macintosh, since the 2007 version, but there are also Windows versions of Stuffit, but SIT has so far there is no meaning.

More info

SIT was the predominant archiving format on the Apple Macintosh platform for a long time. However, it has become increasingly important.

To create a SIT file you need an older version of StuffIt or Stuffit Deluxe. The newer and improved format SITX has replaced the old format. The new format offers not only high encryption (RC4 512Bit) but also special detection routines for various data types. For example, in the SITX format, jpegs, pdf files or MP3s can be compressed according to the manufacturer's statement using an optimized method.

To unzip a SIT file, you can also fall back on the free of charge provided by the manufacturer Smith Micro Stuffit Expander. On the Apple platform included the Stuffit Expander up to OSX 10.3, from OSX 10.4 you have to download it yourself from the manufacturer side.

Programs which can open a SIT file

How to open file with SIT extension?

In order to open a file with SIT extension one of the following programs must be installed on user’s system. If a problem with opening SIT file occurred, it is highly possible that none of the listed programs is present on user’s system. Even if one or more said programs are installed, there may be issues related with given programs. In order to solve a problem with SIT files, follow the instructions below.
Install Micro StuffIt Deluxe or other program from the list

Most often resolving problems with opening SIT files is very simple. Just install an appropriate program that supports such files. All of the listed programs support SIT files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of SIT files or offer file conversion options, but may not be capable of editing such files.

Set Micro StuffIt Deluxe as the default program for opening SIT files

It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate SIT files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Micro StuffIt Deluxe applications is not on the list, select "Browse" option in order to manually locate the directory where Micro StuffIt Deluxe has been installed.


Check the section that lists most common problems with SIT files

Sometimes problems with opening SIT files may not lie with the application itself, but can arise due to other causes, such as:

  • File data is corrupted
  • SIT files has been not been completely download from the internet (only a part of the data has been downloaded)
  • Currently used user account hasn’t been granted necessary privileges to open SIT files (should that be the case, please contact your system administrator or IT specialist)
  • SIT file was being copied from a corrupted storage device and is incomplete or data is corrupted. (Copying files from unknown or untrusted sources should be conducted with great care as such files may contain malicious software, which can damage your system)

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