We are working on converting the wiki to a static website controlled by markdown files in https://github.com/nsis-community. You can already see there how plug-ins will be posted. The end-user interface will still be a website but with a fresh coat of paint. Come meet us at Discord to talk about it.
Reference/ExecShell
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ExecShell
action command [parameters] [SW_SHOWDEFAULT | SW_SHOWNORMAL | SW_SHOWMAXIMIZED | SW_SHOWMINIMIZED | SW_HIDE]
Execute the specified program using ShellExecute. Note that action is usually "open", "print", etc, but can be an empty string to use the default action. Parameters and the show type are optional. $OUTDIR is used for the working directory. The error flag is set if the process could not be launched.
ExecShell "open" "http://nsis.sf.net/" ExecShell "open" "$INSTDIR\readme.txt" ExecShell "print" "$INSTDIR\readme.txt"