The MQH extension is specific to the files used by the online trading platform MetaTradaer. MQH files are generated based on the source code in programming files with the MQ4 and MQ5 extensions. MQH is a header file containing class, function and variable definitions. Such files can be used to automate analytics and trading activities on the platform.

MetaTrader is a tool that facilitates making decisions related to investments, mainly in the Forex market.