OS/2 saved SKF format
File type: Backup file
An adk file extension is related to the OS/2 operating system. An adk file contains floppy disk image stored in SKF file format.
Found 2 different file type records with the same adk filename suffix.
File type category:
Backup file
Date updated: June 27, 2018
Record marked as obsolete and not updated for a long time.
The adk file extension is associated with the OS/2 operating system for IBM-PC compatible computers developed by IBM.
The .adk file is a floppy disk image.
The OS/2 operating system is obsolete product without any support from developer.
Software applications that handle other tasks involving adk files:
Other operating systems or devices
File type category:
Ransomware encrypted file
Date updated: October 6, 2026
Angry Duck is ransomware that encrypts users' files and changes their file extension to .adk. The affected files contain the users' original data in encrypted form.
The ransomware demands 10 BC for the decryption key. The .adk extension identifies files affected by Angry Duck rather than a general-purpose file format.
An .adk file affected by Angry Duck cannot be opened normally while it remains encrypted. It must first be decrypted with a compatible recovery tool or the key supplied by the ransomware.
No known decryptor for Angry Duck is currently available.
There is no meaningful way to convert an encrypted .adk file to another format. The original data must first be recovered or decrypted.
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