Files with the ARH extension are definition files used by compression archivers on DOS operating system. A definition file allows the archivers to determine where and how the compressed file was created. Compressed files store condensed directories or archive data relating to a specific project. ARH files may be modified and edited with compatible software.
The .arh file extension is also utilized as the Hydrologic Simulation file for the ArHymo program, which is a free software (freeware) simulation application for mathematics. The file extension .arh was designed to meet the demands for hydrologic basin modeling, commonly adapted by the National Water Institute of Argentina under the Andean Regional Center. The file extension .arh provides INA with useful information that forms the foundation for the development and deployment of its various programs, including its guiding principles.The file extension .arh also helps the institute to pursue the efforts of its predecessor in meeting the requirements for the development, research, and study involving policies on national water resources. The institute also provides courses to raise the awareness of the current reduction and evaluation efforts, regarding pollution of aquatic environments.http://www.ina.gov.ar/