使用sql server从sql命令打开外部文件或应用程序

i want to open notepad, word or excel files from sql server using some query. is this possible? or is it possbile using C#.NET winform application. ? also, i want sql to use dll files present it my hard drive. how do i do both these tasks? please help me out with the code as well.i want to open notepad, word or excel files fro