Here it is. It appear to have somthing to do with the aircrat air file. Whichever aircraft that is set to the default flight appears in the log file.
********* FSUIPC, Version 3.65 by Pete Dowson *********
Running inside FS2004 (FS9.1 CONTROLS.DLL, FS9.1 WEATHER.DLL)
User Name=""
User Addr=""
FSUIPC not user registered
WIDEFS not user registered, or expired
Module base=61000000
ClassOptions: UIPCMAIN=FF7F, FS98MAIN=FF7F, FS2KMAIN=FF5E
WeatherOptions(Orig)=0000B027[0000B027]
InitDelay: 0 seconds
WeatherReadInterval=4
LogOptions=00000001
DebugStatus=0
15078 System time = 16:54:48
15078 \\KW-GAME\E\Program Files\Microsoft Games\Flight Simulator 9\
15078 System time = 16:54:48, FS2004 time = 12:00:00 (00:00Z)
15281 Client Application: "fs9" (Id=2368)
15281 E:\Program Files\Microsoft Games\Flight Simulator 9\fs9.exe
15281 Product="Microsoft Flight Simulator 2004 - A Century of Flight"
15281 Company="Microsoft Corporation"
21953 Illegal read attempt: offset 0238, size 3 [P2368]
21953Program or module not accredited for use with this unregistered FSUIPC
44562 ### IPC Message processed in 22609mSecs ###
104578 FLIGHTS\OTHER\FLTSIM.flt
104672 AIRCRAFT\c172\Cessna172SP.air
105500 Clear All Weather requested: external weather discarded
114047 System time = 16:56:27, FS2004 time = 16:56:20 (23:56Z)
114047 *** FSUIPC log file being closed
Memory managed: 805 Allocs, 805 Freed
********* FSUIPC Log file closed ****