The .rar file likely contains a pre-configured setup. AMX Mod X is the industry-standard plugin system for GoldSrc servers. This specific pack likely includes:
High-quality weapon models and player skins ported from CS:GO. AMX Mod X - CSGO Final Pack - Proyecto GoldSrc.rar
The (GoldSrc Project) is a long-standing modding initiative, particularly popular in the Latin American and European CS 1.6 communities. Its goal is to modernize the aging CS 1.6 client and server experience by replicating CS:GO's features, including: AMX Mod X - CSGO Final Pack - Proyecto GoldSrc.rar