Word is a content authoring tool, not a web authoring tool so it shouldn't be a big surprise that it doesn't comply with WEB CONTENT Guidelines.

I'm not sure what you are seeking. Word format is not web format. You can convert tables into web format either by copy paste in a wysiwyg editor (controlled by wysiwyg editor converting the rich text format in the clipboard) or by running a macro to convert a table to html code which can be pasted into a code editor which can then be displayed by the wysiwyg editor. If you need the <th> tags to be there without manual intervention then you should look to modify the macros linked in my previous post.

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Andrew Lockton
Chrysalis Design, Melbourne Australia