This might seem obvious, but what about implementing the feature ONLY for files
that are open in read-only mode?

This way, it won't bother the people who need to edit, and those who need to
view, rather than edit a file [and need this feature], open it in read-only
mode. PSPad supports the /R command switch, so editing the registry for any file
types that should be opened in read-only would be easy.

Make any sense?

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