The .HM.gapstat.cmf file is a HyperMesh command file.
This file is created when a non-linear gap analysis is performed and GAPPRM, HMGAPST is set as YES or 1.
When executed in HyperMesh, the .HM.gapstat.cmf file organizes gap elements into two sets, open or closed, depending on the status of the gap at the end of the analysis.
Be sure that the corresponding model is loaded in HyperMesh when executing the command file.