.CNG File

The cng file extension is most notably associated with the CryptoNG encryption software used to protect case sensitive data with AES-256 encryption.

The .cng file contains encrypted data protected by the password.

Files with cng file extension can mostly be found as AES-256 encrypted data encoded by the CryptoNG software. 

How to open:

Use CryptoNG to open and decrypt *.cng encrypted files.

How to convert:

A conversion of the original file is only possible after you have decrypted the *.cng file.