How do I find the path of my exe file?

You can use GetModuleFileNameEx.

DWORD WINAPI GetModuleFileNameEx(
  HANDLE hProcess,    // handle to a process
  HMODULE hModule,    // handle to a module
  LPTSTR lpFilename,  // receives file path
  DWORD nSize         // length of lpFilename
);

This will load the path of the currently running exe file into a buffer named path.

#include <psapi.h>
char path[MAXPATH];
GetModuleFileNameEx(GetCurrentProcess(), NULL, path, MAXPATH);