Hi,
Please try to load this file (created using Office 2016) as MHT using any combination of MHTLoadOptions you like!
Body is blank, but opening it in the Internet Explorer:
IE.png (41.2 KB)
You can also save to any format you like, the same, seems load can’t read it correctly, however, maybe this mht is complex.
BillingStatement.zip (6.3 KB)
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Hi,
Input document is already attached, and no difference how you load it, when saving in a different format, body is lost.
I’ve attached a sample project which will load my input .mht to save it as html and msg
You can see both output files are without body.
WindowsApplication33.zip (23.5 KB)
Thanks 
Your input MHT does not open in MS Word. It also does not open in browser. Please use the valid MHT and let us know if you still face the issue.