C++ actually makes a lot of sense specifically for Win32 API because RAII takes care of releasing all the numerous handles at the right time in the right manner. Also, things like string operations are a pain in pure C (indeed, this app uses stuff like strcpy which is a recipe for buffer overruns etc).

WTL (https://en.wikipedia.org/wiki/Windows_Template_Library) is the oldschool way to do low-level Win32 coding in C++.