Some samples of programs we have written that have Windows interfaces:
Windows interface program that collects options to pass to and run an older DOS based program. The older DOS program converts a text file data into multiple output files needed for a specific task.
Old DOS based multi-function C program written in the 1990's updated and re-compiled with a modern C compiler to run in a Windows 10 environment.
(with Multiple data types)
(and graphing)