Files with .9 file extension are used by malicious YoutubeAdBlocke extension for various web browsers.

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.9 file extension - YoutubeAdBlocke data

What is .9 file? How to open .9 files?

File type specification:

Dangerous and malicious file type icon Dangerous and malicious file type

The .9 file extension is associated with the YoutubeAdBlocke, an extension for Chrome, Firefox and Internet Explorer web browsers.

The .9 file stores some kind of data used by YoutubeAdBlocke.

The YoutubeAdBlocke is reported by potential malicious software! Do not install it to your web browser!

This .9 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this ..9 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files. > Dangerous and malicious file types

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