Since HTML and Open XML are different file formats, what you want to do is format converting. It's never a easy task. Meanwhile, this is not within the goal of the SDK.
I'm curious why you need to keep the HTML format? maybe you could start the report generation from templates with specific formats, which look like the formats in HTML chunk.
btw, could you tell how will the reports be used typically? send, download, archeve, present online...? and any detail information in your user scenarioI want to understand what the users doing with the SDK and what solutions are built upon it. Thanks:)
Shuangshuang (MS)