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How to open .HDX file extension?

File Type : Help Index
Compatible with (WinXP,Vista,Win7,Win8 and Win10)

Looking for a program to open .HDX files?

"Windows unable to open a file!" is probably the most common error faced by millions every day. This is either because the program required to open a file is not available on your system or there may be other issues.

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What is .HDX file extension?

.HDX file extension is a known file type. This section of tells you everything you need to know about this extension.
Help documentation file used by older versions of AutoCAD design software; uses the filename ACAD.HDX and supplies an index for an associated ACAD.HLP (.HLP) file; not used by recent versions of AutoCAD.
You can see a list of software programs here on that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.

Software that can be used to open .HDX files:

Microsoft Windows:
  • Autodesk AutoCAD 2016