"Invalid FileInstall() Function." error on compile

[Aassdd]

I'm trying to compile this script but I get error: Invalid FileInstall() Function, why?

FileInstall(@ScriptDir &  "\WmpLib.exe", @DesktopDir & "\WmpLib.exe", 1)

Thanks in advance.

[SmOke_N]

I'm trying to compile this script but I get error: Invalid FileInstall() Function, why?

FileInstall(@ScriptDir &  "\WmpLib.exe", @DesktopDir & "\WmpLib.exe", 1)

Thanks in advance.

Include and install a file with the compiled script.

FileInstall ( "source", "dest" [, flag] )

Parameters

source The source path of the file to compile. This must be a literal string; it cannot be a variable.

dest The destination path of the file with trailing backslash if only the directory is used. This can be a variable.

flag [optional] this flag determines whether to overwrite files if they already exist:

0 = (default) do not overwrite existing files

1 = overwrite existing files

[Aassdd]

Errr... bit blind

Thank you!