UNIF file icon

UNIF File Extension

Universal NES Image Format ROM Image Format

What is UNIF file?

Full format name of files that use UNIF extension is Universal NES Image Format ROM Image Format. Files with UNIF extension may be used by programs distributed for Windows platform. Files with UNIF extension are categorized as Misc Files files. The Misc Files subset comprises 6033 various file formats. Nestopia is by far the most used program for working with UNIF files. Nestopia software was developed by Martin Freij, and on its official website you may find more information about UNIF files or the Nestopia software program.

Programs which support UNIF file extension

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

Programs that support UNIF file

Windows Windows

Updated: 01/18/2022

How to open file with UNIF extension?

Being unable to open files with UNIF extension can be have various origins. Fortunately, most common problems with UNIF files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The list below will guide you through the process of addressing the encountered problem.

Step 1. Download and install Nestopia

Install software to open UNIF file Problems with opening and working with UNIF files are most probably having to do with no proper software compatible with UNIF files being present on your machine. To address this issue, go to the Nestopia developer website, download the tool, and install it. It is that easy The full list of programs grouped by operating systems can be found above. The safest method of downloading Nestopia installed is by going to developer’s website (Martin Freij) and downloading the software using provided links.

Step 2. Update Nestopia to the latest version

Update software that support file extension UNIFIf the problems with opening UNIF files still occur even after installing Nestopia, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of Nestopia is available. Software developers may implement support for more modern file formats in updated versions of their products. The reason that Nestopia cannot handle files with UNIF may be that the software is outdated. The most recent version of Nestopia is backward compatible and can handle file formats supported by older versions of the software.

Step 3. Assign Nestopia to UNIF files

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

Associate software with UNIF file on Windows

Selecting the first-choice application in Windows

  • Right-click the UNIF file and choose Open with option
  • Click Choose another app and then select More apps option
  • To finalize the process, select Look for another app on this PC entry and using the file explorer select the Nestopia installation folder. Confirm by checking Always use this app to open UNIF files box and clicking OK button.
Associate software with UNIF file on Mac

Selecting the first-choice application in Mac OS

  • From the drop-down menu, accessed by clicking the file with UNIF extension, select Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • Select the appropriate software and save your settings by clicking Change all
  • If you followed the previous steps a message should appear: This change will be applied to all files with UNIF extension. Next, click the Continue button to finalize the process.

Step 4. Verify that the UNIF is not faulty

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

Check UNIF file for viruses
1. Check the UNIF file for viruses or malware

Should it happed that the UNIF 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 UNIF file is indeed infected follow the instructions below.

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

If the UNIF file was sent to you by someone else, ask this person to resend the file to you. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. When downloading the file with UNIF extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Check if the user that you are logged as has administrative privileges.

Some files require elevated access rights to open them. Log in using an administrative account and see If this solves the problem.

4. Check whether your system can handle Nestopia

If the system is under havy load, it may not be able to handle the program that you use to open files with UNIF extension. In this case close the other applications.

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 Universal NES Image Format ROM Image Format 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 UNIF files.

Do you want to help?

If you have additional information about the UNIF 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 UNIF file.

Top File Extensions
Show more
File Extension of the day
step icon


STEP 3D Model

File with STEP extension contains 3D CAD object data saved in text format that conforms to ISO 10303-21 standard, also know as Standard for The Exc...

Last updated