Not sure what the appropriate forum for this is but here goes.
I like to shuffle my RAW files around at the OS level (ie not managing the directory structure via a 3rd party application like LR). I just installed the Olympus Win 7/64 codec http://www.olympus.co.jp/en/support/imsg/digicamera/download/software/codec/raw_codec_dl.cfm
but it still doesn't display the thumbnails (after reboot). The release date for this codec is 2009, which is ominous...
There's also a Microsoft codec http://www.microsoft.com/en-us/download/details.aspx?id=26829
which, although it doesn't list the OMD in the supported cameras, I'd assume that the ORF protocol has been maintained through release of various cameras.
I'm tempted to un-install the Olympus version and try the MS codec however there's a confusing thread on DPR which is not helping the decision.
Anyone figured this puzzle out yet?