[daemin]

The previous version would have been written in C rather than C++ since as someone else has said it's a very basic Windows application, more of a wrapper around the edit control than anything more complicated.

These days it would have to be written in some other language that has those Windows Runtime bindings available for it. So could be C++ but if I were to guess I'd say it's written in Typescript and compiled to a native or .Net binary.