A hdd file extension is related to the STSDAS software and used for its data files.

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HHD file - STSDAS file

What is hhd file? How to open hhd files?

File type specification:

Various data file type icon Various data file type

The hhd file extension is associated with the STSDAS (Space Telescope Science Data Analysis System) a software for Linux and Macintosh, which allows users to analyze astronomical data.

The hhd file stores some kind of data used by STSDAS.

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 .hhd 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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