Unzip error: unsupported compression method 99

By xngo on July 12, 2019


When trying to unzip a zip file, it displays the error message unsupported compression method 99.


The compression method 99 refers to Adavanced Encryption Standard encryption, which is not supported by unzip. However, you can use 7zip to unzip your password-protected file.

In Debian, do the followings:

# Install the full version 7zip.
sudo apt-get install p7zip-full
# Unzip your file.
7z  x  your-file.zip
# Or unzip your password protected file.
7z  x  -pPASSWORD  your-file.zip

About the author

Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.