While searching for an answer to the question - How to open the HPJ file? - you probably found websites, which offer software that was able to open any file extension. Do not be fooled, there is no one program that will allow you to work with any file extension, including the HPJ file. Each program contains a different type of data and you need specialized software to properly work with the HPJ file. Here is a list of programs that are designed to work with the HPJ file - remember, these applications are able to open at most a few file extensions, they are designed to work with a specific data type.
| File type | Microsoft Win Help Project Format |
| Developer | Microsoft |
| Popularity | |
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If after installing the program from a list, you still cannot open a file with the HPJ extension, the reason may be that the file is damaged. The solution may be to find a new copy of the HPJ file you want to open
In this case, the easiest way is to use the tool built into the operating system for association of the HPJ file with applications to support it. Double click on the file you cannot open - the operating system will display a list of programs that are likely to work with your HPJ file. Choose one of them, or select the location on a disk where you installed one of the applications from our list. Windows should then open the HPJ file using the program installed earlier.
Entries containing links of the HPJ file extensions with applications is located in the HKEY_CLASSES_ROOT. If you do not know how to get to the Windows Registry, or how to make changes in it, ask a specialist for help. Lack of knowledge on the subject may cause irreversible changes on your computer.
There may be a situation when a computer virus passes itself off as the HPJ file. In this case, such a file will definitely not be opened. Download a good antivirus program and scan the HPJ file mentioned. If the antivirus application detects malicious data, it may signify that the HPJ file is infected.
| HPS | HPL2 Script |
| HPGL | Hewlett Packard Graphics Language Plot Format |
| HP1 | HP Graphics Language Plotter |
| HPL | Hewlett-Packard LaserJet Vector Image Format |
| HPX | MetaVR 3D Model |
| HPO | HippoDraw Canvas Document |
| HPG | HP Graphics Language Plotter Format |
| HPP | C++ Header Format |
| HPR | RoboHelp Settings |
| HPZ | Helpinator Project |
