thank you !
but i still met some problem.....

it did work if i type

system("start c:\xxx\xxx.exe") in script editor

but when i put this command in my menu .mel script
like this:

global string $gMainWindow;
setParent $gMainWindow;

menu -label "Farrender";
menuItem -label "start Clent" -command "system("start c:\\xxx\\xxx.exe")";

it would even make the menu fail to create;

i thought i must be the string problem after "-command"

so i changed the last line to:

menuItem -label "start Client" -command "system(\"start c:\\xxx\\xxx.exe\")";


this time ,menu create successfully!
but when i click the menu item "start Client"
nothing happen!
no error information.....no effect...

i 'm puzzled

any kind man or woman who can help me?