It looks like the venerable nxrtf.dll made it into 64bit conversion. This exporter writes RTF files, sometimes a bit cranky, but it does pretty well.
Unfortunately it doesn't handle later image formats. I think the image versions it supported fall off somewhere around 2005.
It'd be great if the exporter for later image formats could be added to the server release. nxrtf2.dll seems ready to compile for 64bit, but it's in the 32bit Notes deployment.