"Theese are the DEM relief shading maps for austria version 1.0 as of April 2018. They are to be copied to /garmin folder on mSD and provide shaded relief on Garmin devices" 
 
Windows users how to read... MD5 you can check with many tools e.g. http://www.angusj.com/delphi/md5check_setup.exe
Linux/Mac OSx users how to read... In Terminal on OSx you can check MD5 with md5 or shasum command. Explication see e.g. here: http://www.cnet.com/news/how-to-quickly-check-a-files-checksum-in-os-x/ 
 
 
MD5 Checksum 
F316F06E1F4B26B7E8C412E6C5991984  File:austria-ov.img
 
Last Modified Date and        Filesize in bytes  
16.04.2018  16:14         1'494'016 austria-ov.img