<p>Not too long ago, I had a problem which required me to <a href="https://stackoverflow.com/questions/186237/program-only-crashes-as-release-build-how-to-debug">set WinDbg.exe as the default post-mortem debugger</a>.  Now that I've fixed that and am back doing normal work, it would be really nice if I could set VS to be my default post-mortem debugger.  How does one go about doing this?</p>

<p>Also, how do I make VS attach to an already existing session?  That is, I've got my VS project open in one window, and a command line open where I'm launching my program from.  If the program crashes, how do I get VS to figure out to attach the debugger to the active line in the project that's already open?</p>

from the
Microsoft support page
:
```
```
1.  Start Registry Editor and locate the following Registry subkey in the HKEY_LOCAL_MACHINE subtree:

\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\AEDEBUG
2.  Select the Debugger value.
3.  On the Edit menu, click String.

•   To use the Windows debugger, type windbg -p %ld -e %ld.
•   To use Visual C++ 4.2 or earlier, type msvc -p %ld -e %ld.
•   To use Visual C++ 5.0 or later, type msdev.exe -p %ld -e %ld.
•   To use Dr. Watson, type drwtsn32.exe -p %ld -e %ld. You can also make Dr. Watson the default debugger by running this command:drwtsn32.exe -i.
4.  Choose OK and exit Registry Editor.
```
```