Wants to be able to double click on a drawing in Windows Explorer and have it open in an existing session of MicroStation.
Add one of the following to the MicroStation command line for the file association:
-SingleInstance=Prompt-SingleInstance=Yes-SingleInstance=No-SingleInstance=CancelPlace it prior to the "%1" Under normal windows operations this will cause an open session of MicroStation to close it's open file and display a DGN file activated "doubled clicked" from Windows Explorer.EXAMPLE:D:\Bentley\08050227\Program\MicroStation\ustation.exe -SingleInstance=Yes "%1"
Further Command Line Options
http://communities.bentley.com/products/microstation/w/microstation__wiki/microstation-command-line-options-and-switches.aspx
File Associations
http://communities.bentley.com/products/microstation/w/microstation__wiki/6266.file-associations.aspx