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"
