You've to declare function first.

DECLARE INTEGER ShellExecute IN "Shell32.dll" ;
    INTEGER hwnd, ;
    STRING lpVerb, ;
    STRING lpFile, ;
    STRING lpParameters, ;
    STRING lpDirectory, ;
    LONG nShowCmd
lcList = "Music.m3u"
?Shellexecute(0,"Open",lcList,"","",1)

You can also use WSH

oShell = CREATEOBJECT( "Wscript.Shell" )
lcList = "Music.m3u"
oShell.Run(lcList)

>Don't I need to create an object first?
>Peter
>
>
>>You can use ShellExecute Win Api function.

lcList = "Music.m3u"
>>?Shellexecute(0,"Open",lcList,"","",1)

>>