File Extension SITX

  • Full name
    StuffIt Archive Format
  • Developer
    Smith Micro
  • Popularity
Have you encountered a problem with a SITX 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 SITX file here. In the further part of this page we have added a list of programs that should open your SITX file. It is enough you choose a proper application for your operating system, download and install it.


SITX is the extended format of the archive format SIT. SITX or SIT is a commercial format of the software Stuffit for archiving and compressing data. The format originally came from the Apple Macintosh and was also the long-standing archival format on this platform. Windows versions of Stuffit have been available since 2007, but so far SITX has no meaning there.

To create a Sitx file you need at least StuffIt, the Deluxe version is not necessary. In addition to high encryption (eg RC4 512Bit, Blowfish 448Bit) the SITX format offers above all special recognition routines for various data types. For example, jpegs, pdf files or MP3s are compressed according to the manufacturer's statement with a respective optimized method. To make SITX files usable for older versions of Stuffit, you can enable a compatibility option.

For unpacking a SITX 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 SITX file

How to open a SITX file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the SITX file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a SITX file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support SITX files. At this point we are looking for disk space where the application was installed in and we can link it with a SITX file. Since then, our operating system will use the selected program to support all SITX files.

Other issues

Despite the described problem with SITX there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the SITX file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the SITX file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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