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You have a .dng file — Adobe's attempt to solve the RAW format fragmentation problem. Every camera brand invents its own proprietary RAW format (Canon CR2/CR3, Nikon NEF, Sony ARW), and there's no guarantee today's software will read them in twenty years. DNG (Digital Negative) is Adobe's open standard for archiving camera RAW data.
Some cameras shoot DNG natively (many Leica, some Samsung, many smartphone cameras including Google Pixel and recent iPhones in ProRAW mode). For cameras that don't, Adobe's DNG Converter (free) translates proprietary RAW files to DNG. The conversion preserves all sensor data and EXIF metadata. The debate about DNG vs native RAW is ongoing — purists prefer keeping the original file; archivists prefer the open format.
Adobe Lightroom and Camera Raw handle DNG natively — it is, after all, Adobe's format. Darktable and RawTherapee (both free) support DNG well. For long-term archival of photographs, DNG is the safest bet — it's an open format that won't become unreadable when a camera manufacturer stops updating their codec. Convert to DNG and keep the originals if you're cautious.