Preview will no longer open Canon CR3 files

I've had plenty of coffee today, including an iced mocha (which I frequently make myself at home). Relevant to the topic at hand, after my coffees I also updated my Mac to 26.3, and I find that R5II .CR3 files still do not open properly in Preview.

CrazyAppleMan wrote:

CR3 coming out of R5m2 is the problem. R6m2 works fine for me.

Yes, I'm aware. The RAW files from my R1, R3, and R8 all open fine.

Can no longer edit photos in Photos app on Mac Studio running Tahoe 26.2. Recognises photos but will not work in Editing as generates error message saying file format not supported, yet .CR3 files worked fine a few days ago.

Now try editing same images in iPad Pro (running 26.2.1) and it cannot allow them to be edited either!?

It is surprising, especially since the R1 (which I have) that came out at the same time has no issues, nor do cameras that are newer than the R5II (I just checked an R6III RAW image, it opens fine in Preview).

I just updated to the freshly released Tahoe 26.3 a few minutes ago. I tried to open some Canon CR3 files again and I am getting the same exact result: Bupkis. If anyone has had any luck, please share the good news. I submitted an additional report to Apple support and they used the word " escalate " again. They say they will be calling me back. I am curious as to what "Apple" expects will happen if they continue to issue the same updates to OS and the problem continues. I was able to find numerous complaints from Mac users from years past and it stands to reason that we, the users , should have a reasonable level of expectation that if the problem is recurring, that they will seek a definite solution. Or, am I venting unnecessarily?

dialabrain wrote:

Venting is always unnecessary.

I would say that depends on whether it is meant in the emotional or the physical sense. The V in HVAC for example. Or the pressure relief venting valve on the 7T research MRI that I had installed at a prior company, which the installers left closed as the instrument was filled with liquid helium. Due to the lack of necessary venting, there was a rather large kaboom (fortunately at 4:30am, so the space was vacant). [/humorous-tangent].

CrazyAppleMan wrote:

When I launch Pixelmator Pro1.  via Photos for Editing, Pixelmator Pro complains - "The Pixelmator Pro Photos extension was unable to open the photo in the Photos Library. A photo preview will be opened instead." It then proceeds to open the photo.

A .CR3 RAW file is really just a container, inside that container are both the RAW image data (still mosaiced) and in-camera generated JPG files of different sizes including one at full resolution. What Pixelmator is doing is giving you the embedded full-size JPG file to work on. It's not the RAW file, and all the caveats of working on JPGs will apply (e.g., the white balance setting is baked in, etc.).

I think it's interesting that only people using a Canon EOS R5 Mark II are reporting the problem.

The R7s & R8s are fine as well. 🤷‍♂️

As does Affinity.

Just poured my first cup of dark roast, so even though I have Affinity installed, it slipped my drowsy mind…

I haven't even started coffee. I'm jealous, I have to wait for my better half to get up.

Not jealous, lazy … 😉 I mill my own beans and brew my own coffee. Only have to wait 10 minutes for the brewing part, and then caffeine flows.