I think Bacardi might have had a guide similar to this one somewhere in the SourcePawn Syntax Highlighting for Notepad++ thread. Wherever that thread went.
On a side note: NppExec "helpfully" rebound its help page to Ctrl-Shift-B during its most recent upgrade despite that being the hotkey for compiling in every major IDE everywhere. Which unbound my NppExec shortcut for doing SourcePawn compiling. THANKS NppExec DEVS!
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Not currently working on SourceMod plugin development.