Macros to extract specific values from a .DAT file

I'm currently undertaking a project on my own, in which a tool creates a .DAT file with a ton of channel values, in a pretty complicated format when opened with notepad.

What i'm trying to figure out how to do is:

1. create a button that allows me to browse on my computer and select the specific file I want to import.

2. Create ( a macro maybe?) that will pull out specific values out of this .dat file which, I believe, are always in the same place regardless of which tool produced them.

3. Determine whether these values fall within a tolerance, and have and adjacent cell reading good/bad and color coded Green/Red for within and outside of the tolerance respectively.

I'm pretty much a macro n00b. I could do #3 pretty easily. It's the button creation and being able to locate the specific values in the .DAT file and assigning it to a cell that I'm having trouble figuring out. Any tutorials, reading materials, advice, videos, or anything would be immensely helpful.

Apologies for my terrible punctuation and grammar.