How to read Fireworks PNG multilayer files without Fireworks

"PNG files do not have layers, so Fireworks layers are stored in the private chunks of the PNG files in a proprietary format which is not PNG. I don't know of any program that can read them. You'll need to ask the owner of these photos to convert them to flattened png (mono-layer) or into another multi-layered format such as psd.

If that's not an option, my only advice is to download a trial version of Adobe Fireworks (registration required) to convert these photos."

"Well, if you just need to read these files you can use Batch PNG to JPG to flatten them. It includes a Preview which allows you to actually look at the PNGs if that's just what you want. But if it is animated it will only export the first frame.

So,

XnView viewer, fully supports APNG
Firefox browser, too
ImageJ image processor, too

Meanwhile I noticed you came from Stackoverflow.com. If you need to programmatically access this format, you will need a patch for libpng that gives you support for APNG. It's an excellent (albeit, slightly non-standard) addition to libpng if you need it. It's after all what all the above applications use. ;)"

"How download Fireworks - old version

Open the Creative Cloud desktop app. (Click the icon in your Windows taskbar or the macOS menu bar.)

Click the gear icon in the upper-right corner of the app.

Click Apps. Under Settings, toggle on Show Older Apps, and then click Done.

Under the Apps section in the upper-left corner of the app, click All Apps."
"How download Fireworks - old version

Open the Creative Cloud desktop app. (Click the icon in your Windows taskbar or the macOS menu bar.)

Click the gear icon in the upper-right corner of the app.

Click Apps. Under Settings, toggle on Show Older Apps, and then click Done.

Under the Apps section in the upper-left corner of the app, click All Apps."