I installed Solid Edge 2d about two weeks ago, played with it a little, then haven't used it until yesterday. As of yesterday I can't open any files or even create new ones.
When I click on "open existing file" and select an unaltered sample I get an error: "This name is not recognized. Specify a different name". If I try "new" I get: "Unable to open C:\program files(x86)\solid edge 2d drafting st5\template\filename.dft".
I found my problem - it was a recently changed setting for different software.