A daily updated filename extension database!

HHD file extension

The table below provides useful information about the .hhd file extension. It answers questions such as:

  • What is the .hhd file?
  • What program do I need to open a .hhd file?
  • How can the .hhd file be opened, edited or printed?
  • How can I convert .hhd files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database


HHD file is a STSDAS GEIS Data. The Space Telescope Science Data Analysis System (STSDAS) is a software package for reducing and analyzing astronomical data.
Category: Data files
Application: STSDAS
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
HHD aliases:
HHD related links:
HHD related extensions:

Other types of files may also use the .hhd file extension.

🚫 The .hhd file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

bhd, ghd, hbd, hd, hdh, hgd, hh, hhc, hhr, hhs, hmd, hnd, htd, hud, hyd

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Oracle HyperHub Subkit
HUD Maker File
SmartWare HUD Dictionary Data
Jagannatha Hora Document
Backup Exec Deduplication Storage
HyperTRANSCRIBE Document
C++ Header File
HTML Help Table of Contents
WCAD01 Job Information Data
Geonaute Keymaze Tracklog

🔴 Can't open a .hhd file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .hhd file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .hhd file extension, write to us!

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