NSI file icon

NSI File Extension

NSIS Script

What is NSI file?

NSI is a file extension commonly associated with NSIS Script files. Nullsoft defined the NSIS Script format standard. NSI file format is compatible with software that can be installed on Windows system platform. NSI file format, along with 1205 other file formats, belongs to the Developer Files category. The most popular program for handling NSI files is NSIS, but users can choose among 1 different programs that support this file format.

Programs which support NSI file extension

Below is a table that list programs that support NSI files. NSI files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

Programs that support NSI file

How to open file with NSI extension?

Problems with accessing NSI may be due to various reasons. On the bright side, the most encountered issues pertaining to NSIS Script files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Get the NSIS

Install software to open NSI file The main and most frequent cause precluding users form opening NSI files is that no program that can handle NSI files is installed on user’s system. The most obvious solution is to download and install NSIS or one to the listed programs: Eclipse. The full list of programs grouped by operating systems can be found above. The safest method of downloading NSIS installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Update NSIS to the latest version

Update software that support file extension NSIYou still cannot access NSI files although NSIS is installed on your system? Make sure that the software is up to date. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. If you have an older version of NSIS installed, it may not support NSI 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 NSIS.

Step 3. Associate NSIS Script files with NSIS

After installing NSIS (the most recent version) make sure that it is set as the default application to open NSI files. The method is quite simple and varies little across operating systems.

Associate software with NSI file on Windows

The procedure to change the default program in Windows

  • Choose the Open with entry from the file menu accessed by right-mouse clicking on the NSI file
  • Next, select the Choose another app option and then using More apps open the list of available applications
  • The last step is to select Look for another app on this PC option supply the directory path to the folder where NSIS is installed. Now all that is left is to confirm your choice by selecting Always use this app to open NSI files and clicking OK.
Associate software with NSI file on Mac

The procedure to change the default program in Mac OS

  • By clicking right mouse button on the selected NSI file open the file menu and choose Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • 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 NSI extension message should pop-up. Click Continue button in order to confirm your choice.

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

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper NSI file. Being unable to access the file can be related to various issues.

Check NSI file for viruses
1. The NSI may be infected with malware – make sure to scan it with an antivirus tool.

If the file is infected, the malware that resides in the NSI file hinders attempts to open it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. NSI file is infected with malware? Follow the steps suggested by your antivirus software.

2. Verify that the NSI file’s structure is intact

If the NSI file was sent to you by someone else, ask this person to resend the file to you. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with NSI extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

Sometimes in order to access files user need to have administrative privileges. Log in using an administrative account and see If this solves the problem.

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

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

5. Check if you have the latest updates to the operating system and drivers

Latest versions of programs and drivers may help you solve problems with NSIS Script files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle NSI files.

Do you want to help?

If you have additional information about the NSI file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on NSI file.

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