Open NULL File

The NULL file extension is often used for corrupted files, when applications encounter some kind of error NULL files are created automatically.

The NULL file extension can also be used by log files, error or empty files, etc. NULL files occur on various desktop and mobile operating systems.

There is no standard, format or specification which covers .NULL file, therefore, they can be used on multiple platforms, with different encodings and standards, which makes trying to edit these files tricky.

How Windows opens NULL file

When you double-click a file to open it, the first action Windows does is examine the file extension. If Windows recognizes the file extension, it will open it using the program associated with that extension. Otherwise, if Windows does not recognize the file name extension, then you will receive the following message:

Windows cannot open this file: example.null To open NULL file, Windows needs to know which program you want to use to open it ...

Normally .null files are not designed to be opened by the user, since they are the result of an error in the execution of a subset of lines of code in a specific program.

.Null files and malicious programs, viruses and others

Frequently files with a NULL extension as a side effect of infection by a virus called 'Null', considered a ransomware, which uses the AES-256 algorithm to encrypt user file, thus making it impossible to open the file, and also changes the file extension to NULL.

The file is literally 'hijacked' and if it is of vital importance to the user, then the user will be forced to pay the cybercriminal an amount to decrypt it. Usually the target files are .docx, .jpg, .mp4, .db, .xlsx, etc.

The ransomware launches a pop-up window with information on the infected files and the amount to pay for decryption. Currently, there are several options for removing the Null virus, but there is no program available to effectively restore infected files. The common thing is that the file is recovered from a backup prior to the disinfection made by the user, however, all the changes made to the file before the infection, would be lost.

Open NULL File on Windows

Open NULL File on Mac OS

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Open NULL file article translations

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