16-bit client app failing after installing Windows XP Service Pack 2 (XPSP2)

posted by  techgeek (12)  11 months ago (blogs.msdn.com)

So I've been working on a recent escalation case for my team that deals with a 16-bit client application trying to use a 32-bit out of process com server. When the client application would do CoCreateInstance on the server, this would work fine (hr = S_OK) and the out of process com exe would start. However, if the client then did a QueryInterface for a specific interface, it would fail with this HR:

Error Result : 0x80010104   ( -2147417852 )ID Defined as : RPC_E_FAU