We don't check the extension for html
We don't check the extension for html

...since 86c6f18c2766aad43d6e3bfcf3530e40440ebca7,
so move the related code and comment to the plain
text scope.

Change-Id: I501ebaba915ddaa3f5d1d8d2977d3ba70fb6071b

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core