I have created a file in Visio 5.0 with a .vsd extension. When I go to open the file again I get an error message 100 which states visio cannot open the file as it is not a visio file. The file extension is there as .vsd so the file saved correctly. I need to access this file. Can anyone tell me how to get around this? Or what caused the problem. I really do not want to have to re-create this drawing. Thanks in advance.