Today I had a very disturbing coincidence.
My friend Ariel worked on a SSAS solution with no version control (we're using VSS). Instead of using that, he developed by opening the database on the server. I told him that he must fix it and we must have a recent version-controlled solution. In the past we asked Microsoft support how to do that (we lost all our vss files and had only the databases). They simply said that it's not possible. Ariel has found today that it can be made very easily using File -> New Project -> Import Analysis Services Database, as you can see in the picture: