I would suggest that it will be as simple as:
:com RP :exec "Vst html" | exe "w! " . $TMP . "/test.html" | :q | exe "silent !cmd /c start " . $TMP . "\\test.html"
Having said that, I'm not sure why it is :execused to start Vst, will this not work?
:com RP Vst html | exe "w! " . $TMP . "/test.html" | :q | exe "silent !cmd /c start " . $TMP . "\\test.html"
I do not have the Vst plugin installed, so I cannot verify this.
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