I have two COM projects that I built in VS-2010 and in the Debugger I can see some extra threads. Can someone tell me what Win32 Thread and RPC Callback Thread mean and where I can find information about their details. I attached some pictures from the Threads window where you can see the Call Stack, too.
I agree with Hans Passant's suggestion, these threads would be related to the Windows. Like the RPC Callback Thread in your screen shot, my understanding it was used for the inter-process communication especially for COM+ (DCOM).
Reference: What is an RPC Callback Thread?