OPENROWSETクエリの中のプロシージャのリターン値について

declare @Command nvarchar(4000)

declare @path nvarchar(4000)

declare @rt int

DECLARE @ParmDefinition nvarchar(50);

set @ParmDefinition = N'@rtout int OUTPUT'

set @path = N'dir c:\'

SET @Command =

'SELECT [Name] '+

'FROM '+

'OPENROWSET(''SQLOLEDB'', ''' + @@SERVERNAME + '''; ''sa''; ''password'', ' +

' ''EXEC MYDB.dbo.nsp_RunXpCmdShell ''' +

QUOTENAME(REPLACE(@Path, '''', ''''''), '''') +

''' '') AS a '

EXEC sp_executesql @Command,@ParmDefinition,@rtout = @rt OUTPUT

select @rt,@Command