.HDX File

The hdx file extension is associated with the AutoCAD, a 2D/3D CAD modeling software for Microsoft Windows and macOS (Mac OS X) operating systems.

The hdx file stores index related to help documentation.

The hdx help index format is not used by current version of AutoCAD.

This hdx 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.

An hdx file extension is related to the AutoCAD, a CAD/CAM tool for Microsoft Windows and Apple Mac OS X systems. An hdx file stores help index.

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 .hdx 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.