In a .mht cover page, fields are not populated if a field tag includes an underscore. For example: [r_company].

The field tag needs to be in one string. The Word Editor formats the brackets "["  and "]" into bold font.

.mht files should be created out of an HTML page with Internet Explorer.

1. Open up the .mht file in Notepad.
2. Search for the field tag, for example r_company.
3. Change the <span class=3DSpellE>r_company</span> to <span class=3DSpellE>[r_company]</span>.
4. Repeat steps #2 and #3 for all field tags.
5. Save the file.

Confirmation

The fields are populated in .mht cover page successfully.