How to invoke a file inside directory each time a new file is created

This is not a vb question.
How to invoke a certain software file inside a directory each time a new file is createdin the same directory automatically.
This is like a window event raised when a new file created in this directory that make other software file invoked.
Is this like a service in window 2000? Can any one help or give a hint to where to find help on this.
Can we do something like this without using visual basic or by setting some service inside setting or control panel?

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