On installation HIARCS Chess Explorer is set as the default application to open PGN database files.


If HIARCS Chess Explorer is not the default application for the PGN file type you can set it by right clicking on a PGN file in Windows Explorer and selecting properties when you will see the following:

You will see the line beginning "Opens with", if that does not say HIARCS Chess Explorer you can click Other... and in the dialog that pops up choose HIARCS Chess Explorer from the /Applications folder and click the Always Open With checkbox, then click OK to make HIARCS Chess Explorer the default application to open your PGN databases.