Invalid project file cubase pro 11 - please help!

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hi iwm tring to open my cubase project but a window appears saing “invalid project file xxxxx cpr.”
dose anyone know how to solve this? i have Bak files but i don’t know how to open them

If you launch just Cubase you can use File>Open to open the backup files. I’d recommend making a copy of the entire Project Folder before - just in case.

If you can’t get any of those to open, then the next move would be to create a new blank Project in its own Folder and then use File>Import Tracks From Project to see if you can recover the Tracks.