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used NX2 for several years,, when LR 4 came out, bought it and can't remember when I have used NX2 since,, perhaps a few times to test and compare,,
Same here. However, from time to time is good to verify how the file looks like when decrypted in NX 2.
Some info in NEF files is encrypted and only NX 2 can open it. I wish Nikon never did that but it is what it is.
The only way around it is to open NX 2 and run the Batch process that allows you to save NEF as 16-bit TIFF (the files will get a lot bigger, sometimes even 50% bigger). Now, TIFF is uncompress and lossless file format so you will retain all the info, including the part of the file that is encrypted in NEF files, and have all the info available to other program like Lightroom.
I personally don't want to keep these enormous files on my HD. They take way too much space and just trying to open files 200MB in size for editing takes time, even for the best computers we have now (MacPro with 12 cores and 24GB memory etc.) I have panos stitched that are almost 1GB in size. Try to open that.
So the remedy the situation I simply import my TIFFs into my Lightroom 4 library, then I got to menu: Library -> Convert Photos To DNG.
The DNG format is an open raw format that many camera manufactures already supports. (I think just Nikon and Canon doesn't) and this is similar to NEF format, meaning, also raw lossless and your 200MB TIFF will become again 50MB DNG. While converting you can select option that allows you to remove converted TIFF files, and only DNG will remain in your Lightroom.
It's a bit of work but it works well for me.