I am using the PDM API to update data cards for files. I can lock the file just fine, but I get the message "An attempt was made to access a file that is exclusively opened by another application." when the program calls the UnlockFile method. This is a test folder so these are not open in SOLIDWORKS. Program is a Windows Forms app in C#.

            IEdmFile5 file= null;
IEdmPos5 pos = folder.GetFirstFilePosition()