I think you must add the extension to the exe.

lcOldDir=Fullpath(Curdir())

#DEFINE SW_HIDE             0
lcDir = "C:\Program Files\MySQL\MySQL Server 5.1\bin\"
lcCmd = lcDir + "mysqldump.exe" && Change in this line
lcPrm = "-umybranch -ppassdes > c:\123\mybackup.sql"
DECLARE Long ShellExecute IN "Shell32.dll" ;
	Long hwnd, String lpVerb, String lpFile, ;
	String lpParameters, String lpDirectory, Long nShowCmd
ShellExecute(0, "", lcCmd, lcPrm, lcDir, SW_HIDE)

cd (lcOldDir)

>hi Tore,
>
>thanks so much for the reply.
>
>I have tried it but unfortunately nothing happens.
>
>my original code is (it's working):
>

>lcOldDir=Fullpath(Curdir())
>
>CD "C:\Program Files\MySQL\MySQL Server 5.1\bin\"
>RUN mysqldump -umybranch -ppassdes > c:\123\mybackup.sql
>
>cd (lcOldDir)
>

>
>I changed to:
>

>lcOldDir=Fullpath(Curdir())
>
>#DEFINE SW_HIDE             0
>lcDir = "C:\Program Files\MySQL\MySQL Server 5.1\bin\"
>lcCmd = lcDir + "mysqldump"
>lcPrm = "-umybranch -ppassdes > c:\123\mybackup.sql"
>DECLARE Long ShellExecute IN "Shell32.dll" ;
>	Long hwnd, String lpVerb, String lpFile, ;
>	String lpParameters, String lpDirectory, Long nShowCmd
>ShellExecute(0, "", lcCmd, lcPrm, lcDir, SW_HIDE)
>
>cd (lcOldDir)
>

>
>nothing happens.
>
>am I missing something?
>
>regards,
>
>Jerry