string txd = string(patch) + "\\models\\123.txd";

RwTexDictionary* txd = CFileLoader::LoadTexDictionary(txd.c_str());
TestTexture = RwTexDictionaryFindNamedTexture(txd, "TestTexture2");

plugin-sdk/plugin_III/game_III/CFileLoader.cpp at master · DK22Pac/plugin-sdk

An SDK for developing ASI/CLEO plugins for GTA San Andreas, GTA Vice City and GTA III - DK22Pac/plugin-sdk

github.com