PRJ File - opening and understanding

Did your computer fail to open a PRJ file? We explain what they are used for and recommend software that we know can open or otherwise handle your .PRJ files.

What is a PRJ file?

Files that contain the .prj file extension are most commonly used to store project files. The .prj file extension is a generic extension that is used by a variety of different project applications.

PRJ files normally contain the project settings of a project and other project data, including references to other files that may be used by the related project.

Some of the applications that use the .prj file extension for project files include Maestro, Microsoft Visual Basic, Visual Cafe, Turbo C, FireFly SDK and AwpHelp.

Although many software applications use the .prj file extension, not all PRJ files are interchangeable across all applications. This means that a PRJ file that has been created in one application may not be able to be opened with another application that uses the .prj file extension due to differences in the format of the file type.

How to open PRJ files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension PRJ for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different PRJ openers which you will find listed below.

Suggest another file format using extension PRJ

While we know of one file format using the .PRJ file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .PRJ file.

Various viewers for this file format

These apps are known to open certain types of PRJ files. Remember, different programs may use PRJ files for different purposes, so you may need to try out a few of them to be able to open your specific file.

UltraEditUltraEditUser submitted
DxDesignerDxDesignerUser submitted
CodeVisionAVR C CompilerCodeVisionAVR C CompilerUser submitted
PowerDesignerPowerDesignerUser submitted
Protel SEProtel SEUser submitted
WinEdtWinEdtUser submitted
IDLIDLUser submitted
NI LabWindows/CVINI LabWindows/CVIUser submitted
LabWindows/CVILabWindows/CVIUser submitted
WaveLabWaveLabUser submitted
We have not verified any software that we know for certain will work with PRJ-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with PRJ-files. If you know one, please use the 'Suggest a program' link below and tell us about it!