Lumix .RW2 RAW bug in MacOS Tahoe 26.4 ?

[PJD]

This past Tuesday, March 24, 2026, Apple released their latest MacOS update, "Tahoe" 26.4, and I updated my Mac that day.

After installing the update, I didn't shoot any photos until today (Saturday), and now I realize there appears to be a bug which affects Lumix cameras: On my MacBook Pro 13" M1, MacOS 26.4 can't display/edit/render Lumix .RW2 RAW files in the Finder, or in Apple's Preview app, or in Pixelmator Pro 3.7.1.

Thankfully, Affinity Photo Photo 2.6.5 can display/edit/render Lumix .RW2 RAW files on my Mac running MacOS 26.4. So, I can edit (or convert to .PNG, .TIF, etc. if needed) my Lumix .RW2 RAW files in Affinity until this issue is fixed.

The problem isn't with my camera (S5iiX), because RAW photos I shot & successfully edited in Finder, Preview & Pixelmator Pro _before_ the MacOS 26.4 update now have the same issue. Meanwhile, my old Cannon .CR2 RAW and Olympus .ORF RAW files can display/edit/render without any problem. So it appears Tahoe 26.4 doesn't yet include the required driver/extension for Lumix .RW2 files. This hasn't been an issue with previous MacOS updates.

I don't usually capture to JPEG in-camera, but today I tested that, and as expected they work fine under MacOS 26.4.

Anyone else seeing this Lumix .RW2 RAW issue under MacOS 26.4?

 

[CharlesH]

Thanks for the heads up. I've not updated to 26.4 yet, I have 26.3.1 and now not in a hurry to update. Mac Preview still works okay for .RW2.

That said I don't use Preview that much. I almost always open RAW photos in Lightroom with Adobe RAW, which doesn't depend on Apple.

 

[Pete_W]

Anyone else seeing this Lumix .RW2 RAW issue under MacOS 26.4?

Hi Peter,

I hadn't noticed this yesterday when processing photos as I only ever open the RW2 files in DxO PhotoLab.

So I just checked (MacBook Pro M5 running 26.4) and you are correct, RW2s do not render in Finder or Preview.

 

[PJD]

Thanks for confirming you’re seeing this issue on your updated Mac, too.

I sent Apple a feedback bug report. Hopefully they fix this ASAP. In the meantime, as noted above I’ll use Affinity software. Cheers.

 

[The Rigger]

Suddenly for some reason I don't feel so bad about still running an old iMac in Monterey.

 

[pdk42]

I'm still sticking with Sequoia for the moment!

 

[RuleOfThirds]

I'm still sticking with Sequoia for the moment!

#metoo, latest Sequoia, can't stand that cpu-power-eating glass theme stuff. I'm in no hurry to upgrade

 

[Travis Butler]

#metoo, latest Sequoia, can't stand that cpu-power-eating glass theme stuff. I'm in no hurry to upgrade

Heck, I'm still on Sonoma, though I really need to update to Sequoia while it's still available. Not a fan of Liquid Glass either, though gonna have to update sooner or later.

TidBITS did put out a pretty good article on how to tame Liquid Glass a fair amount: https://tidbits.com/2025/10/09/how-to-turn-liquid-glass-into-a-solid-interface/