There is one other file type using
the HDD file extension!

hdd icon.hdd - Parallels Desktop or Workstation virtual hard disk

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HDD file extension - HelloDOC medical software file

What is hdd file? How to open hdd files?

File type specification:

Various data file type icon Various data file type

The HDD file extension is associated with the HelloDOC French application for doctors and other employees in health care. The .hdd file contains various data used for internal purposes of the HelloDOC software.

Help how to open HDD 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 HDD:

As far as we know, this .hdd 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.

Related links:

HelloDOC website

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