Cheat Engine

[ElectroFusion]

First question: How would I change a files text? example:
# experience factor
net.sf.odinms.world.exp=1000
# meso factor
net.sf.odinms.world.meso=1000
# spawn a character for debugging purposes on every map
net.sf.odinms.world.faekchar=false
# time in milliseconds between loginqueue runs
net.sf.odinms.login.interval=500
# total user limit of the server
net.sf.odinms.login.userlimit=1500
# defaults for channelservers
net.sf.odinms.channel.net.port=7575
net.sf.odinms.channel.net.interface=12.34.56.78
# active event scripts
net.sf.odinms.channel.events=lolcastle,3rdjob

and i wanna change the exp rate through an application
heres what my app has

boxthingy you can type in (expRate is its name)
set button (setExp is its name)

second question, how do i open files using a button in my app?

third and last question(simple), how do I save files using a button in my app?

This is a program im making for my use and for tech school

[hcavolsdsadgadsg]

VB6 or .NET?

[ElectroFusion]

VB6