Windows services that automatically execute

Google "c# windows schedule service" or just "c# how to write a service". You can use threads to sleep\wake at intervals to check the folder or you can use FileSystemWatch to be notified when the folder\files change, then use Process.Start to run an EXE. All you have to do is put these things together, and to answer your next question no I won't write it for you, this isn't a code-on-demand website.

"no I won't write it for you" - I would say you already did it :-)
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