BinHex 4.0 Encoded Format
If you want to edit HQX file and not damage it, you should install dedicated software Using tools such as HQX Online Editors gives less editing possibilities than software adapted to work with the HQX file format.
Remember, that not all of the mentioned programs will allow you to edit the HQX file. Additional information about the HQX file extension can be found here.
This is the best way. Try to open the HQX file with one of the programs and it will see if you can edit the HQX file. The most proven method is to download the installer from the developer's website. Links to the websites of software producers can be found on the software subpages. Below you will find some examples of software programs that support the HQX file (so it is very possible that they can edit files in HQX format).
And here is the full list of programs supporting the HQX file
Remember that many file types have a text format and you can preview their contents by opening them, for example, with Windows Notepad. However, it's dangerous, you can permanently damage your HQX file. After saving the changes, it may not be possible to reopen the HQX file. By far the safest way is to use file editing programs that works with the HQX extension.
It can definitely be said that any of the list of programs that support the HQX extension should be able to edit the HQX file. Still not resolved your file editing issue? Try other solutions. Below we found websites that help in editing HQX files.
Free Online File Edit Service
Copy and paste this link anywhere.