But I don't want to use /inc or /dec. Instead what I want to do is retrieve the value from the file... using readini and then calculate additions or subtractions using writeini.

The file would be written as

file_name

[Username]
Rank = Points

so I would retrieve the points using the readini command but I'm wondering if I can use a wildcard to skip reading the rank.

So to retrieve the points above I would use

$readini file_name username * points

* being the wildcard value in this example.