1.Rename file "base.scs" to "base.zip"
 2.double click to open the file 
 3.go in to "defs" folder
 4.In this folder, you will find folder named "scenarios" and drag this folder 
   to yours desktop.
 5.then delete the "scenarios" folder in "base.zip"
 6.go to "scenarios" on the desktop and open "free_mode.def" with notepad 
 7.change ' money:"1000" to money:"1000000000" '
 8.save the file and copy "scenarios" folder
 9.return to "defs" folder in the "base.zip" and paste
10.rename "base.zip" to "base.scs"
11.when you start new game in free mode you will have $1000000000

Note: you can also edit other files in the "scenarios" folder and can 
change "truck:xxxxxx" with "mch613, kw900, mch603, fcl, flcc, kt2000, 
kk100, p351, p362, vvn, ws, fln"