Since .7z files require specific software to open, it is highly recommended to extract the manual (usually a PDF or folder of images) and keep the uncompressed version on your mobile device for instant access during an actual emergency when every second counts.
: If the manual contains sensitive personal medical info or private emergency plans, 7-Zip allows you to encrypt the file with AES-256 and password-protect the filenames themselves.
While the specific filename likely refers to a compressed archive containing a digital first aid guide, the most useful feature of having such a file in the .7z (7-Zip) format is its high compression ratio and versatility .