#include <windows.h>
#include <Psapi.h>

int main(){
    
 int pid = 3432; // PID of notepad.exe
 char buffer[MAX_PATH];
 HANDLE proc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, pid);   
 GetModuleFileNameEx(proc, 0, buffer, MAX_PATH);
MessageBox(0,buffer,"",0);
}