#include <stdio.h>
#include <windows.h>
#define KEY "SOFTWARE\\ratz\\RRDC\\"

int main(){
  long ret;
  unsigned char *res;
  DWORD size;
  HKEY hkey;
  ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, KEY, 0, KEY_QUERY_VALUE, &hkey);
  (ret = 0) ? (ret = RegGetValue(hkey, KEY, "Pfad", 0x00000002, NULL, res, size)) : printf("%ld\n", ret);
  (ret = 0) ? ((unsigned char *)malloc(size) && RegGetValue(hkey, KEY, "Pfad", 0x00000002, NULL, res, size)) : printf("%ld\n", ret);
  printf("%s\n", res);
}

C:\Users\Administrator\Desktop\RamDiskCleaner>C:\MinGW\bin\mingw32-gcc.exe -o en
vision3.exe envision3.c
C:\Users\ADMINI~1\AppData\Local\Temp\ccEubxmE.o:envision3.c:(.text+0x89): undefi
ned reference to `RegGetValue'
C:\Users\ADMINI~1\AppData\Local\Temp\ccEubxmE.o:envision3.c:(.text+0xf6): undefi
ned reference to `RegGetValue'
collect2: ld returned 1 exit status