The menu item Options -> Window Captions allows you to change how the text on window captions will appear
1 Show Full document title in caption: When turned on this option will include the full path of the current file in the caption instead of just the filename
2 Only show document title in caption: When turned on this option will remove the word Notpad from the caption and just leave the document name.
3 Show document title prefixed: When turned on this option will prefix the document title on the caption and when off, the document title will appear after Notpad.
Note
Options 2 and 3 are not available when in MDI mode due to a bug in the
behavior of MDI on Windows