Привязка типа файла к программе

#include <iostream>
#include <Windows.h>

using namespace std;

bool AssociateFileType( const string & extension,  // расширение файла
                        const string & section,    // секция в реестре
                        const string & path,       // путь к программе
                        const string & info )      // описание
{
    HKEY hk;
    DWORD dwDisp;
    
    // [HKEY_CLASSES_ROOT\.wld] 
    // @="WLD-File" 
    if ( RegCreateKeyEx(HKEY_CLASSES_ROOT, extension.c_str(), 0, NULL, 
        REG_OPTION_NON_VOLATILE, KEY_WRITE, 0, &hk, &dwDisp) != ERROR_SUCCESS )
    {
        if ( RegOpenKeyEx(HKEY_CLASSES_ROOT, extension.c_str(), 0, KEY_QUERY_VALUE, &hk) != ERROR_SUCCESS )
            return false;
    }

    if ( RegSetValueEx(hk, "", 0, REG_SZ, 
        (LPBYTE)section.c_str(), (DWORD)(section.length()+1)*sizeof(section[0])) != ERROR_SUCCESS )
    {
        return false;
    }
    RegCloseKey(hk);

    // [HKEY_CLASSES_ROOT\WLD-File] 
    // @="TAU Engine World File" 
    if ( RegCreateKeyEx(HKEY_CLASSES_ROOT, section.c_str(), 0, NULL, 
        REG_OPTION_NON_VOLATILE, KEY_WRITE, 0, &hk, &dwDisp) != ERROR_SUCCESS )
    {
        if ( RegOpenKeyEx(HKEY_CLASSES_ROOT, section.c_str(), 0, KEY_QUERY_VALUE, &hk) != ERROR_SUCCESS )
            return false;
    }

    if ( RegSetValueEx(hk, "", 0, REG_SZ, 
        (LPBYTE)info.c_str(), (DWORD)(info.length()+1)*sizeof(info[0])) != ERROR_SUCCESS )
    {
        return false;
    }
    RegCloseKey(hk);
 
    // [HKEY_CLASSES_ROOT\WLD-File\shell] 
    // [HKEY_CLASSES_ROOT\WLD-File\shell\Open] 
    // [HKEY_CLASSES_ROOT\WLD-File\shell\Open\command] 
    // @="E:\\[development]\\Programs\\FreedomWorld\\TAU Crafter\\Crafter.exe \"%1\""
    string s = section;
    s += "\\shell\\Open\\command";
    string mod_path = path;
    mod_path += " \"%1\"";
    if ( RegCreateKeyEx(HKEY_CLASSES_ROOT, s.c_str(), 0, NULL, 
        REG_OPTION_NON_VOLATILE, KEY_WRITE, 0, &hk, &dwDisp) != ERROR_SUCCESS )
    {
        if ( RegOpenKeyEx(HKEY_CLASSES_ROOT, s.c_str(), 0, KEY_QUERY_VALUE, &hk) != ERROR_SUCCESS )
            return false;
    }

    if ( RegSetValueEx(hk, "", 0, REG_SZ, 
        (LPBYTE)mod_path.c_str(), (DWORD)( mod_path.length()+1)*sizeof(mod_path[0])) != ERROR_SUCCESS )
    {
        return false;
    }
    RegCloseKey(hk);

    // [HKEY_CLASSES_ROOT\WLD-File\DefaultIcon] 
    // @="E:\\[development]\\Programs\\FreedomWorld\\TAU Crafter\\Crafter.exe,0" 
    s = section;
    s += "\\DefaultIcon";
    mod_path = path;
    mod_path += ", 0";
    if ( RegCreateKeyEx(HKEY_CLASSES_ROOT, s.c_str(), 0, NULL, 
        REG_OPTION_NON_VOLATILE, KEY_WRITE, 0, &hk, &dwDisp) != ERROR_SUCCESS )
    {
        if ( RegOpenKeyEx(HKEY_CLASSES_ROOT, s.c_str(), 0, KEY_QUERY_VALUE, &hk) != ERROR_SUCCESS )
            return false;
    }

    if ( RegSetValueEx(hk, "", 0, REG_SZ, 
        (LPBYTE)mod_path.c_str(), (DWORD)(mod_path.length()+1)*sizeof(mod_path[0])) != ERROR_SUCCESS )
    {
        return false;
    }
    RegCloseKey(hk);
    
    return true;
}

int main()
{
    cout << AssociateFileType(".wld", 
            "WLD-File", 
            "E:\\[development]\\Programs\\FreedomWorld\\TAU Crafter\\Crafter.exe", 
            "TAU Engine World File") 
         << endl;

    system("PAUSE");
    
    return 0;
}