SIT File Extension

What is SIT file?

SIT file is an archive file format developed originally for Macintosh operating system. Today, it is widely supported on many different platforms, although it is not very popular and seldom used. SIT are commonly referred to as “ZIP files for MacOS”. SIT standard is proprietary to Smith Micro StuffIt company, which is not its original creator.

Evolution of StuffIt format

SIT format was quickly replaced by newer SITX format, which offers more features and ans is overall a better format. SITX uses dynamic compression algorithms that optimize compression ratios and decompression times depending on the type of file supplied. StuffIt tools support cloud storage and remote backup options.

Programs which support SIT file extension

The list that follows enumerates programs compatible with SIT files, divided into 2 categories based on operating system on which they are available. SIT files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

Updated: 01/11/2024

How to open file with SIT extension?

Problems with accessing SIT may be due to various reasons. Fortunately, most common problems with SIT files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. We have prepared a listing of which will help you resolve your problems with SIT files.

Step 1. Install ExtractNow software

The main and most frequent cause precluding users form opening SIT files is that no program that can handle SIT files is installed on user’s system. This one is an easy one. Select ExtractNow or one of the recommended programs (for example, StuffIt Deluxe, StuffIt, StuffIt Expander) and download it from appropriate source and install on your system. The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit ExtractNow website and download the installer.

Step 2. Verify the you have the latest version of ExtractNow

You still cannot access SIT files although ExtractNow is installed on your system? Make sure that the software is up to date. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. If you have an older version of ExtractNow installed, it may not support SIT format. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using ExtractNow.

Step 3. Assign ExtractNow to SIT files

If you have the latest version of ExtractNow installed and the problem persists, select it as the default program to be used to manage SIT on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent

Change the default application in Windows

• Choose the Open with entry from the file menu accessed by right-mouse clicking on the SIT file
• Select Choose another app → More apps
• Finally select Look for another app on this PC, point to the folder where ExtractNow is installed, check the Always use this app to open SIT files box and conform your selection by clicking OK button

Change the default application in Mac OS

• From the drop-down menu, accessed by clicking the file with SIT extension, select Information
• Find the Open with option – click the title if its hidden
• From the list choose the appropriate program and confirm by clicking Change for all....
• Finally, a This change will be applied to all files with SIT extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Ensure that the SIT file is complete and free of errors

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the SIT file in question. Problems with opening the file may arise due to various reasons.

1. Verify that the SIT in question is not infected with a computer virus

Should it happed that the SIT is infected with a virus, this may be that cause that prevents you from accessing it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the SIT file is indeed infected follow the instructions below.

2. Ensure the file with SIT extension is complete and error-free

If you obtained the problematic SIT file from a third party, ask them to supply you with another copy. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. If the SIT file has been downloaded from the internet only partially, try to redownload it.

3. Ensure that you have appropriate access rights

Sometimes in order to access files user need to have administrative privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the StuffIt Archive file.

4. Verify that your device fulfills the requirements to be able to open ExtractNow

The operating systems may note enough free resources to run the application that support SIT files. Close all running programs and try opening the SIT file.

5. Ensure that you have the latest drivers and system updates and patches installed

Latest versions of programs and drivers may help you solve problems with StuffIt Archive files and ensure security of your device and operating system. It is possible that one of the available system or driver updates may solve the problems with SIT files affecting older versions of given software.

Do you want to help?

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