I'm currently running Windows 7 x64 Ultimate RC* on my notebook, and I needed to build an ActiveX control for a prototype at work.
Using ATL and the wizards in Visual Studio 2008 to generate the initial control took about a minute, but then I realized I didn't have the ActiveX Control Test Container in the list of external tools in my tools menu.
I searched my system for tstcon*.* but found nothing.
After a brief search, I turned up a thread at Channel 9 discussing this very issue, and it turns out the source for the ActiveX Control Test Container is in a zip file.
On my system, the zip file is
C:\Program Files (x86)\Microsoft Visual Studio 9.0\Samples\1033\AllVCLanguageSamples.zip
and the source for the ActiveX Control Test Container is in
C++\MFC\ole\TstCon
inside the Zip file.
I extracted and built the code (Release x64) but the application wouldn't run, failing with a SideBySide error in the Application log in Event Viewer.
A further search turned up a solution: disable the Enable User Account Control (UAC) linker flag for both the support DLL and the application.
I updated the thread at Channel 9 with this information as well.
I'm going to experiment a little bit and see if I can run both 32- and 64-bit versions of controls in 32- and 64-bit containers, respectively: I may need to do a little reading up on WoW64 to see what the issues are.
* 10 days to RTM!
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