W3U file icon

W3U File Extension

Warcraft 3 Custom Units
  • Developer
    Blizzard Entertainment, Inc.
  • Category
  • Popularity
    4 (5 votes)

What is W3U file?

W3U filename suffix is mostly used for Warcraft 3 Custom Units files. Warcraft 3 Custom Units format was developed by Blizzard Entertainment, Inc.. W3U file format is compatible with software that can be installed on Windows system platform. W3U file format, along with 1509 other file formats, belongs to the Game Files category. The most popular program for handling W3U files is Warcraft III: Reign of Chaos, but users can choose among 1 different programs that support this file format. On the official website of Blizzard Entertainment, Inc. developer not only will you find detailed information about theWarcraft III: Reign of Chaos software, but also about W3U and other supported file formats.

Programs which support W3U file extension

The following listing features W3U-compatible programs. Files with W3U extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

Programs that support W3U file

How to open file with W3U extension?

Problems with accessing W3U may be due to various reasons. What is important, all common issues related to files with W3U extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install Warcraft III: Reign of Chaos software

Install software to open W3U file The most common reason for such problems is the lack of proper applications that supports W3U files installed on the system. This one is an easy one. Select Warcraft III: Reign of Chaos or one of the recommended programs (for example, Warcraft III: The Frozen Throne) and download it from appropriate source and install on your system. Above you will find a complete listing of programs that support W3U files, classified according to system platforms for which they are available. If you want to download Warcraft III: Reign of Chaos installer in the most secured manner, we suggest you visit Blizzard Entertainment, Inc. website and download from their official repositories.

Step 2. Update Warcraft III: Reign of Chaos to the latest version

Update software that support file extension W3UIf the problems with opening W3U files still occur even after installing Warcraft III: Reign of Chaos, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of Warcraft III: Reign of Chaos is available. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. The reason that Warcraft III: Reign of Chaos cannot handle files with W3U may be that the software is outdated. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Warcraft III: Reign of Chaos.

Step 3. Assign Warcraft III: Reign of Chaos to W3U files

If the issue has not been solved in the previous step, you should associate W3U files with latest version of Warcraft III: Reign of Chaos you have installed on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Associate software with W3U file on Windows

Change the default application in Windows

  • Clicking the W3U with right mouse button will bring a menu from which you should select the Open with option
  • Select Choose another app → More apps
  • To finalize the process, select Look for another app on this PC entry and using the file explorer select the Warcraft III: Reign of Chaos installation folder. Confirm by checking Always use this app to open W3U files box and clicking OK button.
Associate software with W3U file on Mac

Change the default application in Mac OS

  • By clicking right mouse button on the selected W3U file open the file menu and choose Information
  • Find the Open with option – click the title if its hidden
  • Select the appropriate software and save your settings by clicking Change all
  • A message window should appear informing that This change will be applied to all files with W3U extension. By clicking Continue you confirm your selection.

Step 4. Verify that the W3U is not faulty

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the W3U file in question. Being unable to access the file can be related to various issues.

Check W3U file for viruses
1. The W3U may be infected with malware – make sure to scan it with an antivirus tool.

Should it happed that the W3U is infected with a virus, this may be that cause that prevents you from accessing it. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. If the scanner detected that the W3U file is unsafe, proceed as instructed by the antivirus program to neutralize the threat.

2. Verify that the W3U file’s structure is intact

If you obtained the problematic W3U file from a third party, ask them to supply you with another copy. 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 W3U extension was interrupted and the file data is defective. Download the file again from the same source.

3. Verify whether your account has administrative rights

Some files require elevated access rights to open them. Switch to an account that has required privileges and try opening the Warcraft 3 Custom Units file again.

4. Check whether your system can handle Warcraft III: Reign of Chaos

The operating systems may note enough free resources to run the application that support W3U files. Close all running programs and try opening the W3U file.

5. Verify that your operating system and drivers are up to date

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with Warcraft 3 Custom Units file. It is possible that one of the available system or driver updates may solve the problems with W3U files affecting older versions of given software.

Do you want to help?

If you have additional information about the W3U 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 W3U file.

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


NeroVision Express Project Format

NVC files are associated with NeroVision Express, a multimedia editing software. What kind of data NVC files contain? NVC files typically contain...

Last updated