If you open nfo files by double click Windows open a system info tool.
But if you open nfo files with a text editor with "open with " it shows it's text.
So it didn't gather anything.
And I would argue unzipped files are less dangerous because you kinda can assume what you download already.
It's also a good idea to have a av.
Avast is very friendly regarding piracy as in they seem to only flag actual malware and not necessarily keygens cracks and stuff ( heuristics can still make mistakes just report them as false positive )