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Is there a way to make notepad++ respect overtype mode when replaying a macro? Macros always seem to insert any typed text.
Replaying of a macro is managed by Scintilla and not by Notepad++ (except for find/replace). So this is something that won't work without Scintilla cooperating, I guess.
Try downloading SciTE, which is the showcase for the Scintilla component, and check whether the overtype mode is being respected in that editor.