You can read a HYPERMESH ASCII file using the File/Import/HYPERMESH ASCII... menu item.
File Import HYPERMESH ASCII...
HYPERMESH is a high-performance finite element pre- and postprocessor for popular finite element solvers, allowing engineers to analyze product design performance in a highly interactive and visual environment.
When selecting this option, the Select File dialog box will appear, where you will specify a filename. This file should have an .hm, .hma, or .hmascii extension.