Yeah, so unplugged the comp after saving the project twice. No extra copy. Try to load it and it gives the "seems to contain errors and therefore can't be loaded" message. Is the file totally jacked or can a previous version of it be recovered? Oh, there were also a lot of ogg files inside, if that would contribute to any opening issues
havent seen that ogg-files caused this.
Please tell us 4 things:
Are there any VSTs in this project?
Do you get a specific name of a plugin, in the error message?
Is your project a mmp or mmpz?
what size does the project have on disk?