Get some help from Microsoft and use an old trick. Record a macro with all necessary clicks and key-presses and translate that to perl. In your case:

- open word and a new document
- type some blabla...
- start recording a macro
- save as HTML (enter all necessary stuff)
- stop recording and edit the macro

that results in the following:

    ActiveDocument.SaveAs FileName:="Test1.htm",
           FileFormat:=102, LockComments:=False,
           Password:="", AddToRecentFiles:=True,
           WritePassword:="", ReadOnlyRecommended:=False,
           EmbedTrueTypeFonts:=False,
           SaveNativePictureFormat:=False,
           SaveFormsData:=False, 
           SaveAsAOCELetter:=False
[download]

There are your parameters, drop the ones you do not need. Record it yourself, because I used a german version of word97.

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And it came to pass that in time the Great God Om spake unto Brutha, the Chosen One: "Psst!"
(Terry Pratchett, Small Gods)