How it works
AUTOEXEC detects1 and captures the files in an input folder2; submits them to any application3, which after processing, writes the resulting files to an output folder4.
In the example above, AUTOEXEC associates an input folder with an application that aims to encrypt the files it finds in that folder.
The hypothetical Crypto Process application can be replaced by any other application that functions by receiving an input file, processing it, and writing an output file.
Examples of applications: .PDF signer, line sorter (sort), file format converter, etc.