http://bugs.winehq.org/show_bug.cgi?id=3011
------- Additional Comments From bon@elektron.ikp.physik.tu-darmstadt.de 2005-31-05 12:45 ------- If you have enough diskspace, run with WINEDEBUG=+relay,+snoop,+comm,+seh and pipe into a file and run until the hang. Check if the hang is a loop of wine calls, or something other, like e.g. a WaitCommEvent that never returns. In the log file, you can also check the context, where the Int2F Handler is called. If it is pctree16, this seems to be some pre-win32 common control implementation, from what I read on the net.
Also, isn't there a Win32 version of that control program? Your problem seems very specific...