All about SIT Files

The SIT file type is primarily associated with StuffIt.

SIT	File extension: SIT
	File type:	compressed archive file

What is a SIT file?

SIT files mostly belong to StuffIt by Smith Micro. SIT files are archived files created by the Smith Micro StuffIt file compression and archiving software developed by Raymond Lau in 1987.

Compression: SIT files became increasingly popular due to their single-step, high compression ratio compared to other compression formats present at the time.
Security: Stuffit enables the creation of email attachments to facilitate access, data security, and document transmission. Stuffit ensures secure archiving of documents made possible by the use of SIT files which have the capability of encrypting important information. SIT files are not as vulnerable to virus infections as other file formats.
Adoption: SIT files were originally developed for the MacOS platform but eventually, versions compatible with Windows were created and they can be generated and opened on all major operating systems including Windows, MacOS, Linux and Sun Solaris.

How to open SIT files

You need a suitable software like StuffIt to open a SIT 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 SIT file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a SIT file directly in the browser:. Just drag the file onto this browser window and drop it.

Online SIT Text Viewer

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Programs that open and convert SIT files:

StuffIt by Smith Micro
See the previous paragraphs to learn more about the main application. SIT files are often referred to as StuffIt compresseds because this type of file is primarily created or used by this software.
Fortran-77 Compiler (compiler source file) by Steven's Institute of Technology
The FORTRAN 77 compiler for the PDP-10 computers uses the SIT file format. It was a load-and-go compiler and was developed by by Steven's Institute of Technology. This file format is classified as System. Related links: PDP-10 on Wikipedia, FORTRAN 77 on Wikipedia
IRT Cronista (infrared image) by GRAYESS
IRT Cronista is an thermographic image management application from GRAYESS that allows analysis, organization, and report creation. A SIT file stores an infrared image viewed in IRT Cronista that is captured using NEC-Avio cameras. This file format is classified as Raster Image. Related links: IRT Cronista Manual
Sinclair ZX Spectrum Emulator (snapshot file) by Pedro M R Salas
The Sinclair ZX Spectrum Emulator is an emulator for ZX Spectrum, an 8-bit computer released by Sinclair in 1982. The emulator has been developed by Pedro M R Salas. SIT is a snapshot file for this emulator. A snapshot file saves the complete emulator state. The R80 emulator can also load SIT snapshots. This file format is classified as Misc. Related links: Details of ZX Emulators with SIT Reference, ZX Spectrum on Wikipedia
The Unarchiver (compressed archive file) by MacPaw
The Unarchiver is a file archiving software for macOS. It supports several archive formats, including SIT. SIT is the old proprietary file format for archives created using Stuffit. This file format is classified as Compressed. Related links: The Unarchiver on Wikipedia, Command-line Version of The Unarchiver for Windows and Linux

SIT format details:

If you can determine the file format, the associated program can also be determined. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. In the following you will find our evaluation of the SIT files:

The SIT file extension is used very often and includes different formats for the applicable programs. However, the following two file formats are common:

55% of all SIT files are associated with StuffIt compressed archive. These are binary files, so they do not contain words or text. The files are on average 2 MB in size and range from 53 KB to 270 MB. The file type is old but is used even today. The following keywords are characteristic: Reserved, StuffIt (c)1997-1998 Aladdin Systems, Inc., http://www.aladdinsys.com/StuffIt/ and StuffIt (c)1997-2002 Aladdin Systems, Inc., http://www.aladdinsys.com/StuffIt/. These files can be linked to toast, installer, lamavstxbeta, installdisc, distiller, heroes, apple and delay.
20% of all SIT files start with the magic bytes Sef, which are always the first bytes of this file format. These are binary files, so they do not contain words or text. The files are 190 KB to 18 MB in size, with a median of 1 MB. E79D6.sit or 14BECE5.sit is a typical file name. These files are attributed to bece.

The remaining 25% of all SIT files are files with no common format, such as ZIP. These files are often connected to sequencing, crispr, private, lesson, pilot or icons. You can get all the details of your SIT file by dragging it onto this page or by clicking the button "Choose your .sit file to analyze" above.

Technical Data for SIT File Extension

File classification:

Compressed

Related files:

seq, fastq, toast, sea, tunn3l_v1s10n, sef, 3dmf, sitx, site, sit%3f%3f, zip, suit, zlib, stuff, hqx, md5, ist, sip, sti, txt, 1

Mime type:

application/x-stuffit, application/x-sit

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.Archive.Expand, FileType: StuffIt Archive, AppName: StuffIt for Windows 8.0
EXEFile: stuffit.exe

ProgramID: StuffIt.Archive.View

ProgramID: StuffItArchive, FileType: Aladdin StuffIt Archive, AppName: Aladdin Expander

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

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

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

ProgramID: StuffItArchive
EXEFile: f:\Cserve\Download\Aladdin systems\Expander.exe %1

ProgramID: StuffItArchive
EXEFile: %ProgramFiles%\Aladdin Systems\StuffIt 7.0\Expander\Expander.exe %1

ProgramID: StuffItArchive
EXEFile: %ProgramFiles%\WinZip\winzip32.exe %1

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

ProgramID: Qzip.sit
EXEFile: %ProgramFiles%\QuickZip\Quickzip.exe %1

ProgramID: StuffIt.Archive.View
EXEFile: %ProgramFiles%\Aladdin Systems\StuffIt 7.5\stuffit.exe -view %1 -from_shell

ProgramID: SecureIt
EXEFile: %ProgramFiles%\Secure IT\secureit.exe

ProgramID: StuffItArchive
EXEFile: %ProgramFiles%\Aladdin Systems\StuffIt 7.0.2\Expander\Expander.exe

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

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

ProgramID: MimarSinan Codex
EXEFile: %SystemRoot%\explorer.exe /idlist,%I,%L

ProgramID: DeCypherIT
EXEFile: %ProgramFiles%\DeCypherIT\decypherit.exe

Show all 20 listings To Top

a sit 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 SIT files

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