How to change a string in a text file...

[SuperDre]

I cannot imagine what those PrivateProfile APIs have to do with the OP's request

I have a user enter an IP address that is being written to a file in the form of
10.x.y.50

The text file should appear as...

IPAddress=10.20.30.50
IPAddress2=10.30.45.50

which is exactly what you can do with the WritePrivateProfileString Is used for, writing and reading INI-kinda files, exactly what he's asking for..... but then using API..

Hmmm.. Sorry, now I see what he's actually asking..

I need to make another IP address from the user input IP address to take the form of 10.(x+10).(y+15).50

well, it was late at work and I was in a hurry to get out so I didn't read the question correctly..

But then the Split is the best simple option or just parse it with Instr(), but that's much more code..