Well, I think this is the right forum because I am really trying to find out how windows XP decides to display a certain icon for a given file type. If I knew that, I might be able to get my icons ...

Editable file types appear with a text file icon when you browse your Dropbox, and they're opened immediately with a tap.

You can use the macOS Finder's Copy command to copy and paste files. But here's how to use the same command to copy file icons into Preview.

Jack Wallen shows you how to use the search feature to more efficiently locate the configuration option you need to edit in the nano text editor.