I use notepad !
Perhaps if cmd shell isn't allowed, you can create a shortcut to the exe on the desktop that goes something like this
Target: "C:\Program Files\FreeBASIC\fbc.exe" "c:\myprog.bas"
StartIn: "C:\Program Files\FreeBASIC"
You can do that by going into explorer and finding the freebasic install and creating a shortcut to it on the desktop.
Right click it, properties, and add "c:\myprog.bas" with the full path to your basic file.
The when you double click the shortcut it'll build your program. Quite difficult to see any error messages though...
Jim