this is a project from 2007, some other (earlier versions of same project) projects files in same folder do open. I tried using the bak and it wont open either.
I've had this issue years ago, old projects caused a crash in the Media Generator .dll. No one could resolve this. I now include the full version number of Vegas in the project name and keep every point release archived, just to be sure to be sure.
do you have a second editing computer? I had a similar thing happen. Nothing worked. I switched over to my other computer and pasted the folder to the HDD. Opened no problem. Tried it again on the computer I edited it on... wouldn't open.