NEF file extension not recognized in Sequoia v 15.8

Thank you for another reply. To answer your question, the External Flash Drive is the Extreme Portable SSD at 2Tb... and it works just fine with the older MacBook Pro and I can copy files to the Macintosh HD (i.e., C:\ in Windows NTFS) on my i5 MacBook Air.

It appears that the issue I'm having is based on "Preview" in Finder. When I checked "Open With" for an .NEF file it wanted to use On1 as the default but this is very slow to load even when wanting to launch it.

I updated my Nikon NX Studio app and it is now the default for "Open With" but Preview seems to take over when hovering at the file and Finder locks up when still looking at the .NEF file. I have to kill Preview using command+option+escape and then relaunch Finder to get control back for viewing thumbnails... even of .JPGs.

I'm thinking I'll just have to work around using Finder to Move .NEF files; it appears I can Copy files within Sequoia 15.8's Finder without issue... just not give Finder a chance to "preview" the file using View - Columns.

As I started as a network administrator with Microsoft NT 3.51 in the 1990's, this is not the first time I've had to suffer work arounds as the world changed to Windows 2000, etc. I'm still glad that I've made the switch to Macs a decade or so ago but it is hard to have to relive the effect of new hardware forcing new software at this point in my life... both for cost and relearning how to use it efficiently.

One, taking a long time for a file move is not the same as Finder not recognizing NEF files.

Just to be absolutely clear, you are moving a file from one folder to another in Finder and not moving the file in ON1? Is ON1 open at the same time with the same folder open? Which model MacBook Air are you using? Which version of ON1?

FWIW, I have no issues with file moving or copying Nikon NEF files in the latest version of ON1 and macOS Golden Gate. Also, I never had issues when I was running what was the current version of ON1 at the time I was running macOS Sequoia.

Without additional info, you can try a Disk First Aid in Disk Utility on the volume(s) that you are working with. There may be some directory corruption.

Thank you for your reply; I appreciate that functioning of Finder is different than On1 and am happy to provide the following:

My MacBook Air is the last with Intel chips, 1.1Ghz Quad i5 and that is (presumably) why I'm stuck at macOS Sequoia v15.8... which I just updated to.

I've just returned from Egypt with well over 2000 images on my Nikon Z50 and I always shoot both JPG and RAW (NEF), then sort the files into separate folders for processing.

My speed issue just occurred after the update and only affects moving files from a base "dump" folder (a copy from the Nikon's flash) to a \NEF folder on the internal flash drive; i.e., C:\workingNEF. To check that it is a MacBook Air issue I'm using an older MacBook Pro 13" with macOS 11.7.11 and a SanDisk 2Tb external flash and I am not having any issues with moving files.

I only mentioned using On1 to clarify that this app can see and process .NEF files that have been moved by other means... but On1 is not loaded when having the speed issue in Finder.

I hope this helps as I'd really like to update to an M5 version of the MacBook Air but I just turned 80 and that would really stress the budget.

Thanks.

So, I think I've got it now.

When you say Sandisk external flash, is it an SSD drive, SD Card, or a USB "thumb" drive (USB stick as some refer to)? Exact product names or model numbers will help.

How is that drive formatted?

Also, how much free disk space is available on the MacBook Air?

To clarify, this involves moving files in Finder; it appears my On1 program is still functioning, but it takes minutes to move a single file on the same internal drive.