>>I want to open the files interactively and should be
>>able to work with these.
You will. It just drops a bitmap-type image on the screen
until you activate it, by available methods, thru code.
You can pop up a common dialog for the user to select a
file from, and then use the OLE.CLASS and OLE.SOURCEDOC
properties to assign to the OLE window.
To step thru it:
1) Start a new (standard exe) VB project, and on the form,
drop an OLE control.
2) A dialog now pops up for "Insert Object" ...
select "Create from file", and browse to a .SLDDRW file.
Click "OK", and give it a minute to set up.
3) Resize your Form, and OLE control, to the max size you
want. Change the "SizeMode" Property to "Stretch",
change the "AutoActivate" property to "GetFocus".
4) In you Form.Load procedure, set the focus to the OLE
control using "OLE1.DoVerb vbOLEShow"
5) to get the dwg OBJECT, like in SW, use OLE.Object