How do I get explorer to open files with txt extension?

With the advent of the GUI, the issue of file management and interface behavior arose. The Windows platform allowed multiple applications to be associated with a given file type, and different file "actions" defined for opening, editing, viewing, and so-forth by means of a context menu. File managers such as Windows Explorer can have applications assigned for almost every file name extension. For example, a text editor for .txt, a word processor for .doc or .odt, a web browser for .htm or .html, PDF viewer or editor for .pdf, a graphics program for .png, .gif or .jpg, a spreadsheet program for .xls or .ods, etc.