Files with ctbl file extension can also be found as some sort of suspicious encrypted archives generated by a blackmailing malware. 

There are 2 other file types using
the CTBL file extension!

empty icon.ctbl - Xamine NSCL data

empty icon.ctbl - 3D Slicer colors module

Detailed description

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CTBL file extension - Malware encrypted data

What is ctbl file? How to open ctbl files?

File type specification:

Dangerous and malicious file type icon Dangerous and malicious file type

The ctbl file extension is associated with some type of blackmailing virus, which encoding, or encrypting user's data, like documents, photos, pictures etc. and forces user to pay money for decrypt data back to original files.

Protect your computer by antivirus and backup your files to prevent your data against viruses and other malware.

Help how to open:

It doesn't look like there is any standard way how to open or access these files. The purpose of these files is to lure users to buy something they don't need, in order to open these files.

How to convert:

Probably cannot be converted to other formats.

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