Hello,
Eagle 6.4 LE Windows (Win7, 64-bit) seems to have a bug with parsing double-quotes in directory names.
I.e. Google Drive application creates a following folder: C:\Users\admin\„Google“ drive\
Then, in Eagle: Options->Directories->Projects->Browse - above folder is added
The newly added folder is parsed succesfully, projects are loaded. However, after closing Eagle and starting it again, a message popups: "The directory C:\Users\admin\Google drive\ doesn't exist - create it?". Notice, the double-quotes have dissapeared in the directory name.
The same record, withouth double-quotes is also present under Options->Directories->Projects.
The next time eagle is started, the projects folder is now "C:\Users\admin\?Google? drive" (instead of absed double-quotes the questionmark appear)