In gamedev a lot of people read those docs but not a lot of them shipped anything using it. The reason is that file paths are not everything that has A/W versions. There is user input, window message handling ... The API is a maze.

I really would like to learn otherwise. But when I have to suggest fixes my old opinion stays. Dropping any C runtime use and going from API macro or A version to W is the solution to all weird and hard to repro problems on platforms from Ms.