I never understood the popularity of the '.C' extension for C++ files. I have my own preference (.cpp), but it's essentially arbitrary compared to most other co

I never understood the popularity of the '.C' extension for C++ files. I have my own preference (.cpp), but it's essentially arbitrary compared to most other common alternatives (.cxx, .c++). The '.C' extension is the only one that just seems worse (this case sensitivity issue, and just general confusion given how similar '.c' looks to '.C'). But even more than that, I just don't get how C++ turns into 'C' at all. It seems actively misleading.