: If the file was found on a public site or sent by an unknown sender, scan it using an online antivirus tool like VirusTotal before attempting to unzip or open it.
: This indicates a standard compressed archive containing one or more internal files, such as PDFs, spreadsheets, or database exports. Recommended Actions
: Commonly refers to "Use Case," "Unified Communications," or "Under Construction."
: This suffix often identifies "Control," "Catalog," or "Compressed Text." It is also a common shorthand for "Computed Tomography" in medical imaging or "Cheat Table" in gaming software.
: If you received this from a specific platform or colleague, look for an accompanying metadata file or email.