Hi, as the generation of pdf for preview is not 100% accurate, I suggest modifying the MS Add-on to generate the preview pdf if the MS Office support it and upload it at the same time as the document itself. I also suggest allowing the user to manually upload a preview pdf too. This way, it is possible to by pass the inaccurate preview pdf generation and use the pdf generated by MS Office. Thank you.
The solution you propose will not solve anything ( from openkm side you still need converting pdf to swf ). This topic is the same than another topic you have yet opened, I suggest do not open new topics for same issue and continues with the first opened.
Note: I'm not sure if community version has the option - at profiles - of embeded preview, what will use acrobat reader plugin in browser for previewing and will not cause to you the conversion problem. Take a look on profiles at general tab.