Hi IBZ,
Application.DefaultFilePath
'Sets and returns the default path used when files are opened'
It points to the Solid Edge Program Folder. This is the folder where Egde.exe (and licence.dat etc.) is located. I believe you want to use it for the wrong purpose.
Just a guess, but maybe you can use it if you got two versions of SE installed. You can set the right program folder for the Edge.exe you want to start.
You can open a specific file using; Application.Documents.Open(C:/Temp/Test.par).
Maybe this gets you further.
Wouter (Erwo)