Opening file with associated program

I have SpeedButton on my form and I want it open avi file with associated program.I tried 开发者_开发知识库Windows.winexec but it doesn't seem to be worked.

You want ShellExecute - see http://msdn.microsoft.com/en-us/library/bb762153%28VS.85%29.aspx for the API and also this link http://delphi.about.com/od/windowsshellapi/a/executeprogram.htm for details of how to use it from Delphi.