To convert to rFactor, all you need is 3dSimEd and notapad.
In rFactor locations folder make a new folder for your track 'yourtrackname', in that folder make another folder called 'tracknamemas',
Open the trk file with simed and export the gmt's as rFactor gmt's and save them to the folder you made 'tracknamemas'
Export textures to the same place.
Copy your data files, trk, aiw, cam thumb and loading. *not gdb
Change the extention of the trk file to scn and open it in notepad.
Change the searchpaths to
SearchPath=.
SearchPath=yourtrackname
SearchPath=yourtracknamemas
Underneath SearchPath add masfile entries *note yourtracknamemas.mas is commented out, that will be uncommented right at the end last of all.
//-------------------------------------------------------
//MASFile=yourtracknamemas.mas
MASFile=sky.mas
MASFile=COMMONMAPS.MAS
//-------------------------------------------------------
Find any BTB track that you have installed for rfactor and copy over the sky.mas to the folder 'yourtrackname'
Open any BTB rfactor scn file in notepad and copy the skybox entries.
Go to yourtrackname.scn highlight the skybox entries, delete them and paste the ones you just copied.
Save the scn and close it.
Copy any gdb file from another rfactor track, paste it in yourtrackname folder and rename it.
Open the gdb file and append the first line and trackname, event name etc. The save.
Fire up rFactor and it should all work. If it does, mas up the gmt's and textures into yourtracknamemas.mas (or any name you want to call it)
Then append the scn file and uncomment MASFile=yourtracknamemas.mas and delete/comment out SearchPath=yourtracknamemas
Fire it up again and if it all works, your done.
*I think I have included every step here, I have tried to keep it brief, let me know if something doesnt work and I will see what I missed.