Notepad always opened .txt files, but I changed to MSWorks after Notepad stopped working. I fixed Notepad, and want to change back to it (to open .txt files). The problem with Notepad was that the ...

The Windows operating system uses the file extension to understand how to open a file. For example, when you double-click to open a TXT file, Notepad probably opens it.

Google wrote they "open sourced the C++ library that our production systems use for parsing and matching rules in robots.txt files.