Re: Adding new file type support and thumbnail generation, why is it so hard to find clear examples on adding functionality?
I can't find any questions you may have previously posted (under your current user name), so of course you did not get any responses when no question has been asked...
Thumbnail / preview support can be added through transformers. ImageMagick (which Alfresco already knows how to use) can convert wmf to any other image with the right decoder. Adding thumbnail / preview support for WMF may just be as easy as ensuring ImageMagick has the decoder available / installed (may require a custom build / install for ImageMagick instead of the pre-built binary shipped with Alfresco installers / images). As far as I can see, the implementation of the ImageMagick transformer should work with most image/xxx mimetypes, so as long as WMF files are represented using image/wmf instead of application/wmf the transformer will happily deal with those files as long as the decoder is available.