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Unable to open "myfile.raf" because the file format module cannot interpret the file.

Forum|Forum|12 days ago
April 19, 2026
3 replies
104 views

Since updating to Photoshop 27.5 with the new ACR engine, Super Resolution images (140 MP) won’t open anymore. I get this error:

“Unable to open ‘myfile.raf’ because the file format module cannot interpret the file.”

Before the update, I could open 3–5 of these 140 MP images (64 GB RAM) without any issue, for exposure blending and HDR work.

Correct answer Ged_Traynor

@ImZeOne there’s an updated version of ACR in the below link, see the reply from Rikk Flohr_Photography for the download link

I just installed it and tested with the file you provided, and it works on my system now

ImZeOneAuthor

Participating Frequently

You can download a .RAF file here and try : https://transfert.free.fr/C5Lbxih

I suspected there might be a limitation on the size of upscaled images, but that wouldn’t make sense. Why let the generative AI process run for a minute for nothing? It would be better to display a popup indicating that the original image exceeds that limit.

Thanx again.

Ged_Traynor

Community Expert

@ImZeOne I was able to reproduce the error with the file you supplied, but I got a different error message.

But I downloaded some sample files from here

https://filesamples.com/formats/raf

Also from here

https://drive.google.com/drive/folders/193s1-XbxOh1Ce94thDk4SFIc71U4c88m

It works fine with the files downloaded from the above links

ImZeOneAuthor

Participating Frequently

The message I provided was slightly different because it was in French and I had to translate it.

Note that I also have .RAF files from a Fuji X-E5, and the issue is exactly the same. I suspect Adobe may have changed the AI upsampling process and introduced a size limit, but I haven’t seen anything about this.

If that’s the case, it’s unfortunate, as running AI upscaling followed by downsampling back to the original size (or to +10-20%) produced much better results than standard processing in ACR.

D Fosse

Community Expert

Just tested and it works correctly here (but on .arw and .dng). I’m surprised a preferences reset didn’t fix it - maybe you need to reset Photoshop preferences as well.

Can you try with ACR hosted by Bridge, not Photoshop? You do that by right-clicking the file in Bridge and choosing “Open in Camera Raw” (instead of just “Open”).

Also, try a DNG.

ImZeOneAuthor

Participating Frequently

I tried that as well — I completely removed Photoshop and ACR, keeping nothing, specifically to avoid reinstalling them with old preferences that might be causing the issue. I also tried launching ACR explicitly from Bridge instead of double-clicking, with the same result. I tried dng too.

Thanx

Ged_Traynor

Community Expert

@ImZeOne I just downloaded a sample .raf file, and it opened in ACR version 18.3 without issue, have you tried resetting the ACR preferences

ImZeOneAuthor

Participating Frequently

Thanks Ged,
I had already tried all of that before posting here — it’s often possible to find a solution without bothering the community. I reinstalled Photoshop and ACR and reset the preferences, but without success.

My .raf files open without any issue in Photoshop after going through ACR, but they no longer open if I’ve run Super Resolution beforehand, even though it appears to process the image correctly.

Ged_Traynor

Community Expert

@ImZeOne can you share one on the .raf files to test, I tried applying super resolution in ACR, and it opened fine in Photoshop afterwards

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