Hello,

I've developed a MFC based ActiveX control using VC++ 6.
In the last days I've tested the control compatibility with the various
language of Visual Studio.NET and it seemed to work correctly.
Today I was forced to change the control version stored inside the .odl file
from 7.3 to 7.4 and with big surprise, if I now open the VS.NET projects the
control is disappeared from the Window form in which it was created (and
obviously compiling the project I get errors that say that the type of
control is not defined).
If I now close the VS.NET project, put back the control version to 7.3
inside the .odl file, recompile the ActiveX control and reopen the VS.NET
project, the ActiveX control appears on the form as espected.

The line changed inside the .odl file was similar to the line below

[ uuid(xxxxxxxx-xxxx-11d2-8183-000xxxxxxFD8), version(7.3),

and was simply changed to

[ uuid(xxxxxxxx-xxxx-11d2-8183-000xxxxxxFD8), version(7.4),

Why VS.NET projects cannot accept this version change when an ActiveX
control changes its version?
This is causing me a big panic because this means that projects developed
could stop working for a simple change of version of an ActiveX control.

What must be do to avoid this problem?

Thanks in advance and Kind Regards

Severino