Where is the location of the file that stores Mac keyboard shortcuts?
Cocoa text system keybinding defaults:

The standard key bindings are specified in /System/Library/Frameworks/AppKit.framework/Resources/StandardKeyBinding.dict

To override Cocoa text keybindings:
...create a file named DefaultKeyBinding.dict in ~/Library/KeyBindings/ and specify bindings to augment or replace the standard bindings. You may use the standard bindings file as a template. It is recommended that you use the Property List Editor application to edit a bindings dictionary. You may use another application such as TextEdit or Xcode, but if you do you must ensure the encoding of the saved file is UTF8.

https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/EventOverview/TextDefaultsBindings/TextDefaultsBindings.html