exe.config is just an XML file that your program or some routines in .NET ( and C# ) can use.
Still your program needs the right libraries - or you need to write some code - to be able to use and take control of this file.
The equivalent for this are the good old .ini files what does the same, but in 2021+ it seems old scool.
Your VO application ( WIN/32 C code; not C# and not .NET ) needs to the have the right routines to manage that file.
You can create an exe.config file, but you need to write your code in your program; just as for .ini files.
I only "looks" moderner than ini files :)
Alternative, you can have these settings in other types ( database, JSON, or ... )