Using trk2sg.exe:

This tool is part of the N3 Sandbox and can be used to convert an existing .trk file to .sg so you can edit it in SGE.exe and SFE.exe to then build a new track from. I have used it for my Long Beach 2005 and Watkins Glen 2005 tracks.

[You need to have the N3 Sandbox installed]

I have set up a seperate sg2trk conversion folder and I advise you to do the same. This is how to do that:

1. Create a folder called icr2 [very important or it will not work];
2. Copy any N3 .dat file to this folder and call it icr2.dat;
3. Copy the DOS4GW.exe and TRK2SG.exe files to this icr2 folder;
4. Make a .bat file with the following line or launch a DOS Prompt and type:
            trk2sg.exe icr2.trk
5. If the program can convert the .trk to .sg it will now do so and a working icr2.sg will be produced. No error message means it has done so succesfully.
6. Edit the icr2.sg with SGE and SFE and go along from there.