NIS 17.5.0.127 is flagging tsmuxergui.exe as being suspicious and removed it for me. I downloaded it from http://www.smlabs.net/tsmuxer_en.html (http://www.smlabs.net/tsMuxer/tsMuxeR_shared_1.10.6.zip). It's a recommended utility at http://www.maximumpc.com/article/features/handbrake?page=0%2C6.
I don't know whether this is a false alarm nor am I sure what the proper channel is to submit possible false alarms.
I'm not the developer of the app, just a user.