Opening a SITX File

The SITX file type is primarily associated with StuffIt.

SITXFile Extension SITX
File extension: SITX
File type:  compressed archive file

What is a SITX file

SITX files mostly belong to StuffIt by Smith Micro. Files that have the SITX extension are generated by the StuffIt X compression software.

  • Compression: The SITX format makes it possible for large files to be compressed. For a higher compression ratio, it uses ATOM compression technology, thereby achieving higher rates of compression than regular SIT compression. SITX files are generated and used by version 7 of the Stuffit Expander for MAC or version 8 of Stuffit Deluxe for Windows.
  • Encryption: The SITX file format combines file compression and file security. Encrypted files contain a duplicate of the document generated and encoding is done by a 512-bit encryption to ensure safety.
  • Development: The SITX format was developed by Raymond Lau for Aladdin systems which was acquired and now owned by Smith Micro Systems. SITX files are also compatible with Drop Stuff.

How to open SITX files

You need a suitable software like StuffIt to open a SITX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your SITX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a SITX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online SITX Text Viewer

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Programs that open and convert SITX files:

  1. StuffIt by Smith Micro
    See the previous paragraphs to learn more about the main application. SITX files are often referred to as StuffIt compresseds because this type of file is primarily created or used by this software.
  2. Archiver (compressed archive file) by Incredible Bee
    Archiver is a file archiving software from Incredible Bee. It supports several archive formats, including SITX. SITX is the file format for the StuffIt X archive compressed by StuffIt. This file format is classified as Compressed. Related links: Archiver FAQs, Archiver Reviews
  3. The Unarchiver (compressed archive file) by MacPaw
    The Unarchiver is a file archiving software for macOS. It supports several archive formats, including SITX. SITX is the file format for the StuffIt X archive compressed by StuffIt. This file format is classified as Compressed. Related links: The Unarchiver on Wikipedia, Command-line Version of The Unarchiver for Windows and Linux

SITX file format details:

If you can determine the file format, the associated program can also be determined. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. File extension, signature and file format must match; otherwise errors will occur when the file is opened. So you need a detailed analysis of a file to find out the format and the associated program. In the following you will find our evaluation of the SITX files:

The SITX file extension is not common and is mainly used by one program with a specific format. The following file formats are most commonly found in SITX files:

All other SITX files (10%) have different formats. Just click the "Choose your .sitx file to analyze" button on this page to find out what your SITX file is.

Technical Data for SITX File Extension

File classification:
Compressed
Related files:
sitz, sit, six, xml, zip, 1, sea

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: StuffIt.X.Archive.Expand
EXEFile: %ProgramFiles%\StuffIt Standard\stuffit.exe -expand %1 -from_shell

ProgramID: StuffIt.X.Archive.View
EXEFile: %ProgramFiles%\Aladdin Systems\StuffIt Standard\stuffit.exe -view %1 -from_shell

ProgramID: StuffIt.X.Archive.View
EXEFile: %ProgramFiles%\Aladdin Systems\StuffIt\\stuffit.exe -view %1 -from_shell

ProgramID: StuffIt.X.Archive.View
EXEFile: %ProgramFiles%\Allume Systems\StuffIt\stuffit.exe -view %1 -from_shell

ProgramID: PowerDesk.Archive
EXEFile: %ProgramFiles%\VCOM\PowerDesk\PDExplo.exe %1

ProgramID: StuffIt.X.Archive.Expand
EXEFile: %ProgramFiles%\Allume Systems\StuffIt\stuffit.exe -expand %1 -from_shell

ProgramID: StuffIt.X.Archive.View
EXEFile: %ProgramFiles%\Smith Micro\StuffIt\stuffit.exe -view -from_shell

ProgramID: StuffIt11.Archive.Open.Sitx
EXEFile: %ProgramFiles%\Smith Micro\StuffIt11\StuffIt11.exe -o


a sitx compressed archive file is a special file format by Smith Micro and should only be edited and saved with the appropriate software.

How to solve problems with SITX files

  • Associate the SITX file extension with the correct application.
  • Update your software that should actually open compressed archive files. Because only the current version supports the latest SITX file format. Search, therefore, e.g. on the Smith Micro manufacturer website after an available StuffIt update.
  • To make sure that your SITX file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
  • Click here to open your .SITX file online - secure, fast, and no downloads needed.
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