Cannot save changes to .HTM files

[NRGeti]

I am new to VI and need some help on editing .HTM files. I have set up a
project and obtained the DEFAULT.HTM file using the Site Diagram control as
well as adding some pages to the control. Changes to text on the page are
saved but any change I make to the Type or Home check boxes in the
Appearance tab of the Property Sheet are not saved.

Specifically, I check any of the boxes and do a File/Save, then File/Close.
When I open the file again and look at the boxes, my changes are gone and
the edits have reverted back to the original.

I have tried setting permissions in IIS in every combination I can think of
and nothing helps.

Can anyone help?