如何通过调度程序基于某个文件（1.htm）的存在启动程序（比如calc.exe）？

I need to start a program based on existence of some file (1.htm) on the same machine using scheduler. I don't want to write any extra code. is it possibele by using that is already on windows for e.g listener etc. 1.html sometimes exist and doesnt' exist sometimes. So strictly I need to run (calc.exe) only when 1.htm exists. Basically I'm looking for somekind of listener program on window that listens on existence of 1.htm and trigger the launch of calc.exe.I need to start a program based on existence of