Here is the .project file for the angry cats demo.
Notice how the sections of the document match up with the project directory? You need to do the same thing for your game.
If I trim down the document to its basic sections, you have something like this
Now the thing about XML is that elements are nested within one another. You will need to put your assets nested within the appropriate section like so
//...do this for all of your sprites
The same rule applies for all of your assets. If you do not have any sounds, or paths, I think you can just remove the section entirely.
THe last thing you should notice is how there are multiple <objects> sections nested inside a parent objects section. This is just how GMStudio keeps track of your groups (folders) that you create inside of GMStudio.
If will be fine if you just put all of your assets one after the other inside of a single parent element, you will just lose any organization that you had done.
If you need more help, try to compare the Angry Cats .project file with the folder structure of the project, and with how it appears when you open it in GMStudio. They are all related.
Even if there is a fix, that doesn't necessarily mean that you will be able to get your .project file back. If you still need help, send me a download link to your project directory and I can get the document started for you with the appropriate sections and format.
Edited by vertex67, 20 June 2012 - 02:02 PM.