If Microsoft Project cannot open a file, you can repair corrupted Microsoft Project files by following the solutions mentioned in this post.

How to Open a PRJ File. The ".PRJ" file extension identifies a project file associated with multiple software programs. Microsoft Visual Studio saves development projects as PRJ files; AIMMS ...

This plugin provides a quick way to accesss the .sublime-project file of the current Sublime project. Simply open a Sublime project and use the keyboard shortcut (Alt+Shift+P) or via toolbar option in ...

2] Verify the project file Let’s assume that you have deleted the project file from the respective directory after opening it in Visual Studio. It may have happened by mistake.