How to open HP4 files
Did your computer fail to open a HP4 file? We explain what HP4 files are and recommend software that we know can open or convert your HP4 files.
What is a HP4 file?
The HP4 file extension indicates to your device which app can open the file. However, different programs may use the HP4 file type for different types of data.
While we do not yet describe the HP4 file format and its common uses, we do know which programs are known to open these files, as we receive dozens of suggestions from users like yourself every day about specific file types and which programs they use to open them.
We are continually working on adding more file type descriptions to the site, so if you have information about HP4 files that you think will help others, please use the Update Info link below to submit it to us - we'd love to hear from you!
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Various HP4 openers
These apps are known to open certain types of HP4 files. Since many different programs may use HP4 files for different purposes, you may need to try a few of the apps to open your specific HP4 file.
 | Harpoon Classic - Commander's Edition | User submitted |
 | Winharp32 | User submitted |
 | PVI.Starter | User submitted |
Try a universal file viewer
Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.