The 3GB enabler is an awesome utility that has a magic tendency to fix one of the last remaining outstanding of Sid Meiers Railroads instability. While the process could hardly be much simpler with the script there is one rather nasty reliance; for 32bit versions of windows you need to manually tell windows to allow 3GB enabler to work. Traditionally this was done by use the 3GB switch in boot.ini. Unfortunately Windows Vista and 7 no longer use the boot.ini, but don’t worry users of Vista & 7 32bit, Microsoft didn’t leave you high and dry.
I came across the solution after Sam brought the quandary to my attention. The solution is actually quite simple, go to the start menu and in the search box type ‘cmd’, don’t hit enter. Wait until ‘cmd.exe.’ appears on the menu and then right click and select “run as administrator”. Then run this command:
BCDEDIT.EXE /Set IncreaseUserVa 2900
You can copy and paste that into the command prompt by using the right click menu, keyboard shortcuts CTRL+C and CTRL+V don’t work in the command line. Then restart for the changes to take effect.
Note: Users of 64bit OSes don’t need to do this step and can use the 3GB enabler directly.