DNG files created with LR4 do not show thumbnails

Hi,
When using LR3 to create DNG files from my RAW files, those files would show me thumbnails of my image in Windows Explorer. I am running Windows/7 (64) and have installed a CODEC from "Fast Picture Viewer" that allows thumbnails from RAW & DNG files to be shown. It seems, however, that the thumbnails do not show for DNG's created with LR4.
To Remedy this I uninstalled the CODEC. Downloaded the most recent version and installed it but this did not fix the problem.
I then went to the user forum for the CODEC product and searched for my problem. I found a thread who's solution is to turn off "Embed Fast Load Data" when exporting to DNG and it fixes the problem. I tried this and indeed it did fix it. The responder went on to say ".....When this option is enabled the files created are no longer DNGs (just an undocumented private format of Adobe that no one else can read to this date)". This statement surprised me as it is counter to what I understand Adobe created DNG to be. Can I get some input on this comment as if true it is very troubling.
My second question is that I see where to turn off the "Embed Fast Load Data" in the LR Export module, but where do I do the same thing in the Import module when I'm selecting import mode "Copy to DNG"?
And, my thrid question is this. If indeed the DNG files created by LR4 are proper DNG files and this CODEC is just flawed in some way, does anyone have a better way to allow image thumbnails to be shown in Windows Explorer?
Thanks -- Dan

Hi David,
You testing does not coincide with mine. I have consistently kept "Use
lossy compression" turned off. With lossy turned off, it seems that using
Fast Data Load prevents the thumbnails from displaying whereas turning off
"Fast Data Load" allows the thumbnail to be shown.
Below is comment from Adobe confirming that they have yet to release the
spec containing "Fast Data Load".
From: Ian Lyons [email protected]
Sent: Tuesday, June 05, 2012 12:29 AM
To: Califdan
Subject: DNG files created with LR4 do not show
thumbnails
Re: DNG files created with LR4 do not show thumbnails
created by Ian Lyons in Photoshop Lightroom - View the full discussion

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