: You can often right-click and select "Open with" > Windows Explorer to see the files.

: Standard 7z archives begin with the magic bytes 37 7A BC AF 27 1C in hex. If the file doesn't open, checking these headers is the first step in troubleshooting a corrupted archive.

Based on the file extension , your file is a compressed archive created with the 7-Zip archiver. A "write-up" for looking at a gallery.7z file generally involves verifying its contents or troubleshooting if it is a challenge-related file (like in a CTF or forensics scenario). How to Look Inside gallery.7z

: If the file is encrypted (AES-256), you will be prompted for a password. Forensic tools like FTK Imager or Exiftool may not show internal metadata unless the archive is decrypted first.