For make a program that decrypt/encrypt ini files you can use whatever programming language you want. I was making that in AuToit because its simple.
And after you decrypt ini you can use any text editor you want to edit ini file.
Here you go example source code + compiled 32 bit and 64 bit to test in attachment.
Virus scans give false positive because of AuToit, but you can use 1st file its a source code just to see how this works.
