If you add a keyword to an NEF file on Vista using the supplied NEF Codec from Nikon ACR can no longer read the file.

Here is the codec:

<http://www.nikonimglib.com/nefcodec/>

You can also reproduce this on Windows XP by downloading the codec and Microsoft Photo Info tool and adding a kewyord.

Can you email such as modified file? (click on my name to see my email address)

Done, sent you a link to download...

Bibble may have the same problem - see this thread in the Bibble support forums:
<http://support.bibblelabs.com/webboard/viewtopic.php?t=4984>

"I think there is a problem with Bibble, NEFs and the Vista NEF-Codec (which is directly from Nikon): If I import a NEF file (or tag it - Vista tags all files while importing) they can't be edited in bibble."

Yet more reports of problems:

"I tested the D70s NEFs against CS2 Camera RAW 3.6, Bibble Pro 4.9.5, DXO Optics Pro and RawShooter Premium and all could not read them unitl I reopened them in Capture NX and resaved them".
<http://forums.dpreview.com/forums/read.asp?forum=1034&message=21879922>

"Important note to users of the Nikon RAW Codec for Windows with Nikon RAW files: We have received reported compatibility issues with their Nikon NEF files after installing Nikon’s RAW codec".
<http://blogs.msdn.com/pix/archive/2007/01/30/nikon-raw-codec-issues.aspx>