How to use .bat to open default program?

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Is it possible (using cmd or .bat) to automatically open a text file using the default Windows application?

For example, when opening a .html file, if Chrome is my default browser, the .html will open with Chrome automatically. How can I tell the cmd (or .bat) to open the default program for a particular file extension?


Use the start command, which I believe uses ShellExecute():

start "" "My text file.txt"

(The first empty parameter is often required.)