Can .hta files be viewed in a Page Viewer Web Part?There are no mistakes; every result tells you something of value about what you're are trying to accomplish.

Hi, if you are able to view it normally in explorer and if the file type is not blocked in SharePoint then you will definitely able to view the file in Page viewer web part.Warm Regards, Pratik Vyas | SharePoint Consultant | http://sharepointpratik.blogspot.com/