DO NOT DELETE EXPLORER.EXE !!
you change your system.ini from this
always use the short path description (8.3) since MS has ****ed up the long path names when it comes to the ini files.
the two most important things to do is
make a backup of your system.ini before you change it
Make SURE that you can boot from a floppy and has a boot floppy. this way you can always copy your old file over the modified one.