.PRJ File

File extension prj is traditionally used for files that contain projects. Projects are works in progress, these can be documents, 3D graphics, music, or pretty much anything that takes some time to create.

Projects contain settings, positions of saved windows, development notes and other raw data that wont be present in the final file.

When a project is finished, it is usually saved or exported to regular format of the program, or some other exchangeable format.

These .prj files are used in many programs, however they are almost always complete different formats and as such, can only be opened in the original application.

Files with prj extension can generally be found as project. Used in many programs to save work in progress.

How to open:

Use the program from which the *.prj file originated to open and work with it.

How to convert:

Generally speaking, projects can usually be exported to some sort of output / exchange format dependingon the original program. Audio projects export to audio files, video projects to video files etc.