You cannot open part .003 on its own. You must use a tool that can "stitch" them back together:
To "prepare" or open the file , you need to have all the other parts of the split archive in the same folder. This specific file is the third part of a larger compressed set. 1. Collect All Parts MHIMBD270.7z.003
Right-click specifically on the . The software will automatically detect parts .002 and .003 to complete the extraction. You cannot open part