: Open the file in a hex editor like HxD . Look for the "Magic Bytes" at the start of the file. A standard ZIP file should start with 50 4B 03 04 ( PK.. ).
: Use 7-Zip or WinRAR to "View" or "Open archive" rather than "Extract All." Look for file extensions like .txt , .cfg , .bin , or .dat . Uju01.zip
Before attempting to open the archive, verify its origin and safety. : Open the file in a hex editor like HxD
If the file is safe, use specialized tools to see what is inside without fully "installing" or running unknown executables. If the file is safe, use specialized tools
: If you are comfortable with the command line, use Binwalk to search the archive for embedded files or hidden firmware images that standard zip utilities might miss.
: Use a dedicated virtual machine or a tool like Any.Run to interact with the file in an isolated environment. 2. Inspecting the Contents