: These are typically the actual instruction manuals or "ReadMe" files. Use Adobe Acrobat Reader or a basic text editor to read them.

You cannot open this file directly with Windows or macOS built-in tools. You must use an extractor:

: These are often firmware updates. Do not unzip these further unless the instructions specifically say to; they are usually uploaded directly to the handheld device via SD card or USB. 3. Troubleshooting