P: Lr Desktop 9.2 Photo Renaming Adds Suffix for Mixed Extensions (DNG + JPG)

Question

When I use the “Photo Renaming” function in Lightroom 9.2 (this actually happened in the previous release as well) LR would struggle with file extensions.

For example: If I select .DNG and its corresponding .JPG and then rename them using “YY-MM FILENAME” it would show in the Preview ““YY-MM FILENAME.DNG”. However when executed it would update the DNG to “YY-MM FILENAME.DNG” while the JPG would be named “YY-MM FILENAME-2.JPG”. This happens consistently when selecting multiple photos with identical filenames but separate file extensions, no matter if stored in the Adobe Cloud or locally. This would not happen in LrC 15.2!

Anshul_Saini · Accepted Answer

@thephotochroma​@PhotochromaThank you for your patience and for following up.I checked with the product team again regarding this behavior. Their current assessment is that this is working as designed, rather than being treated as a product bug.The reasoning is that when two files share the same base filename, for example:IMG_0001.DNGIMG_0001.JPGLightroom also has to account for the associated XMP sidecar naming. Without differentiating the filenames, both files would map to the same sidecar filename (IMG_0001.xmp), creating a naming conflict. To avoid that, Lightroom Desktop appends -2 to the second renamed file, resulting in:YY-MM FILENAME.DNGYY-MM FILENAME-2.JPGSo, while the file extensions differ, the suffix is intentionally added to prevent XMP filename collisions.I understand this differs from Lightroom Classic’s behavior and can be unexpected if you’re accustomed to that workflow. I appreciate you taking the time to report it and follow up on it.Best,Anshul Saini

jatinjain29 · Answer

Hey ​@Photochroma,This behaviour is as per design.When two files share the same base name, likeIMG_0001.DNGandIMG_0001.JPG, Lightroom also has to account for their XMP sidecar naming. Both of those files would map to the same sidecar name,IMG_0001.xmp. To prevent that collision, Lightroom appends-2to the second renamed file, which is why you seeYY-MM IMG_0001-2.JPG.So while the extensions are different, the suffix is added intentionally to avoid an XMP filename conflict.

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