Every time I open this one specific project file in Magix Music Maker, it crashes. It's the normal Windows 'this program is not responding and needs closing' dialogue box. I've opened other project files, but it goes on as normal.
First, please read this post. It explains the sort of information which could help us fellow-users to help you! At the moment we have no information about your computer nor even the version of MusicMaker you are using.
Unfortunately, what you describe is often symptomatic of a corrupted project file. If so, I fear you have no option but to start the project from scratch again, unless you have any backups of the file, in which case, try loading one of those to see if the problem persists.
I had the same problem. To avoid deleting the track and starting over, try making another copy of it and saving it to your desktop. Open up the desktop copy and it should work.