How do I stop multiple sessions of Autocad opening?

[StubbesPrecast]

I am running AutoCAD 2006 LT and AutoCAD 2010 on one computer and have the SDI set correctly. When I open multiple files from Windows Expolorer, it opens multiple AutoCAD sessions. How to avoid this from happening?

[pendean]

What is WIndows Explorer set to use to open DWG files? right-click on a DWG file, select OPEN WITH and find out. It should be ACLAUNCHER.EXE for what you desire (how it works on our PCs).

By the way, neither of your programs is AutoCAD Architecture, the furm is dedicated to this version of AutoCAD only, why are you posting here?

[StubbesPrecast]

Thanks, I will give that a try.

The reason I am posting in this forum is because I am using AutoCAD Archtecture 2010.

[pendean]

Thanks: it helps if you use that name instead of just 'autocad' as there are ARCH (or ACA as others call it) tools not available in plain AutoCAD.

[StubbesPrecast]

Still the same issue...