You copied a folder of photos off your Sony Alpha, double-clicked a file ending in .ARW, and Windows either showed a blank icon or threw an error. That file is a RAW photo, not a broken image, and the reason it will not open is simply that most default viewers do not know how to read Sony's RAW format out of the box. Below are the practical ways to view, develop, and convert ARW files on a Windows PC, plus how to do it without sending a single photo to the cloud.
What is an ARW file?
ARW is Sony's RAW photo format, written by Alpha mirrorless bodies and many Cyber-shot and DSC cameras. A RAW file holds the unprocessed sensor data straight off the camera rather than a finished JPEG, which gives you far more latitude to recover highlights, lift shadows, and fix white balance later. That extra data is also why an ARW is not a plain picture your operating system can paint without a decoder.
Think of it this way: a JPEG is a cooked meal, while an ARW is the raw ingredients. Your camera captured everything the sensor saw, and a program has to develop that data into something you can actually look at. Different Sony models write slightly different ARW variants, so a brand-new body can produce files that an older viewer has never seen.
Why your ARW files will not open on Windows
Windows Photos and File Explorer can preview JPEG and PNG natively, but RAW support is bolted on separately. On a fresh Windows 10 or 11 install you often need Microsoft's free Raw Image Extension before thumbnails even appear. Even with that add-on, very recent Sony cameras can outpace the installed codec, so the newest ARW files still refuse to render.
A second common snag is the camera itself. When Sony ships a new sensor, the color science for that model has to exist in whatever software you use, otherwise colors look flat or wrong. Software that keeps an up-to-date library of camera profiles handles new bodies gracefully, while anything stale falls behind.
Three ways to open ARW files on Windows
- Microsoft Raw Image Extension. Install this free add-on from the Microsoft Store and Windows Photos can display many ARW files and show thumbnails in File Explorer. It is the lightest option, though it is a viewer rather than a real editor, and brand-new camera models are sometimes unsupported.
- Sony's own desktop software. Sony offers free tools for browsing and developing its RAW files. They open ARW reliably because they come from the same company that wrote the format, but they are built around Sony bodies only and are not a general library manager for your whole collection.
- A dedicated photo manager that decodes RAW locally. If you want to browse, develop, and organize thousands of ARW files in one place, a purpose-built manager is the comfortable choice. One such Windows app is Memora, and its approach to RAW is worth a closer look because every step runs on your own machine.
Opening ARW files with Memora, step by step
Built for Windows 10 and 11, Memora is a photo manager with its own RAW engine, so it reads Sony ARW files directly rather than relying on a system codec. Here is the shortest path from a card full of RAW photos to something you can view and edit.
- Install Memora on your PC and open it. You can grab it from the Memora download page.
- Point Memora at the folder that holds your ARW files by adding it as a watched folder. Those photos get indexed in place, and your originals are never moved or altered.
- Let it decode. Under the hood, a three-tier RAW decoder covers more than a thousand cameras, and the first time it meets a new Sony body it fetches that camera's color profile once (by sending only the make and model text), then caches it for next time.
- Click any ARW to see a full-size, color-accurate render with a pleasing baseline look already applied.
Want the full picture on which formats decode and how the engine is built? The RAW support feature page lays out the supported file types and the decoding pipeline in detail.
Editing an ARW without wrecking the original
Once a Sony RAW is open, you will usually want to push exposure, recover a blown sky, or warm up the color. Edits here are non-destructive, which means every adjustment is stored as data in the catalog and your actual .ARW file on disk is never touched. Nothing is baked in until you export, so you can experiment freely and reset whenever you like.
Basic develop sliders such as exposure, contrast, and color are available on the free tier, which is enough to make a flat RAW look finished. Stepping up to the paid tier adds presets, film looks, and AI-suggested edits for people who want to move faster across a big shoot.
Converting ARW to JPEG (and keeping your metadata)
Most people who ask how to open an ARW really want a shareable copy at the end. Export your developed Sony RAW to JPEG, PNG, TIFF, WebP, or BMP, or copy the untouched original byte for byte. Your EXIF data rides along on export, so the capture date, camera, lens, exposure, ISO, and any copyright you set stay attached to the finished file.
One honest limit worth knowing: Memora does not re-export to RAW formats, so there is no ARW-to-DNG or ARW-to-HEIC conversion here. For most workflows that is a non-issue, since the point of converting is to leave RAW behind and hand off a universal JPEG or TIFF. Exporting one photo at a time is free, while batch-exporting a whole folder is a paid feature.
Keeping your RAW library private
Cloud photo services decode and store your pictures on their servers, which means your personal shots pass through someone else's infrastructure. By contrast, everything stays local: your photos never leave your computer, and all decoding, editing, thumbnailing, and searching happens on your own CPU or GPU. No photo, thumbnail, or metadata value is ever transmitted anywhere.
There are a few honest exceptions worth naming, because pretending an app is fully offline would be dishonest. The software contacts its own server only to check your license and for updates, it fetches a camera's color profile by sending just the make and model string, and it downloads AI models once. None of that includes your photos. If privacy is the reason you are moving off a cloud tool in the first place, this local-first model is the whole point, and you can compare it against a cloud editor on the Lightroom alternative comparison.
Finding a specific Sony shot later
Opening one ARW is easy once the decoder works. Finding the right frame inside ten thousand of them is the harder problem, and it is where a manager earns its keep. On-device semantic search is built in, so you can type a plain description like "backlit portrait on a beach" and watch matching photos rank without any manual tagging, all computed locally. The semantic search feature page explains how that model scores your library.
Frequently asked questions
Can I open ARW files for free?
Yes. Microsoft's Raw Image Extension is free, Sony's desktop tools are free, and Memora decodes and previews RAW files on its free tier. You only pay if you want extras such as batch export or film looks.
Do I need internet to open an ARW file in Memora?
Decoding runs entirely offline. The only network touch is a one-time lookup of your camera's color profile (make and model only) and routine license or update checks, none of which involve your actual photos.
Why do my newest Sony photos still not open?
A camera released very recently can write an ARW variant your software has not learned yet. Using a manager that maintains a broad, current camera profile library, rather than an old system codec, is the reliable fix.
Will opening an ARW change the original file?
No. Your RAW files are read in place and edits are stored separately, so the file your camera wrote stays exactly as it was until you choose to export a copy.