Files with THMB extension are mostly thumbnail previews or larger images.

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THMB file extension - Thumbnail file

What is thmb file? How to open thmb files?

File type specification:

Bitmap image file type icon Bitmap image file type

The THMB file extension is reported to be used for some sort of thumbnail files. Might have been used in some older programs especially on Mac platform. Also could be a typo for the ITHMB file.

Help how to open THMB files:

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 file with extension THMB:

As far as we know, this .thmb 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.

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