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Dear Sir:

FastRawViewer doesn't convert any raw or JPEG images, it displays them and allows to set ratings and labels, and also some conversion parameters that are acknowledged by Lightromm/ACR.

Are your images NEFs or JPEGs?

What happens when you instruct Lightroom to import your NEF files? If Lightroom refuses to import, please check that your Lightroom version is up to date and that D7100 and D500 are listed for your version as supported cameras.

You can always send us a link to one of the files Lightroom refuses to open, and we will see what's wrong. To send the files, you can use free services like Dropbox, Google Drive, WeTransfer, etc.