.md files are "Markdown" files. They're human-readable plain-text files with some special formatting (such as creating hyperlinks with [this syntax](example.com).) It should definitely be readable in notepad, or Sublime Text itself. That said, I'm using Sublime Text 3 and also can't find the Builder's Brewery version. But last I checked, it's not up to date with current LSL functions/constants anyway. I would recommend a package called just "LSL", I have version 2.6.3 from github.com/Makopo