HPJ File Extension
Help Project Format
- File Type hpj
- Developer Microsoft
- Popularity
- Application Microsoft Windows Help
- Category Blocked Email Attachment Files, Document Files
What is a HPJ file?
The HPJ extension is used by Help Project Format and falls under the categories of Blocked Email Attachment Files and Document Files, covering 1045 files.
Microsoft, the developer of the Help Project Format (HPJ), has released file format and 242 programs designed to handle them.
HPJ files are compatible with various operating systems, including Windows. There are 3 programs available to open a HPJ file, including popular tools like Microsoft Windows Help, Adobe RoboHelp and Microsoft HTML Help Workshop.
Programs that support HPJ files
How to open a HPJ file?
If you are having trouble opening a HPJ file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.
Microsoft Windows Help, Adobe RoboHelp and Microsoft HTML Help Workshop are recognized as the most popular software solutions for dealing with HPJ files. If you wish to install the latest release of Microsoft Windows Help, visit the official Microsoft portal and download the edition that works on any operating system.
Once Microsoft Windows Help is installed, the OS should configure it as the default tool for opening HPJ files.
Set Microsoft Windows Help as the default HPJ handler
Setting a default program by file type in Windows
- Right-click on your HPJ file and choose the "Open With" option. Then click "Choose another app" to continue the process;
- In the pop-up window, find and select the Microsoft Windows Help application from the available options;
- Make sure the "Always use this app" checkbox is checked and click "OK" to confirm your choice as the default app for opening HPJ files.
Choose an app to open a file on Mac
- Right click or use Control + left click on the desired HPJ file to launch the file options menu;
- Select "Open in application" and click "Other";
- Towards the bottom of the window, find the "Enable" menu, which is already set to the default option, "Recommended Programs";
- In this menu, select "All Programs" and search for Microsoft Windows Help. Check the box next to "Always open in app" to make it the default option.
How to edit a HPJ file?
Editing HPJ files requires installing professional software that lets you open and edit blocked email attachment files. Online editors have more limitations compared to dedicated Help Project Format programs.
List of Top HPJ editors 2026
According to these factors, we have compiled a list of available HPJ editors.
| HPJ Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Adobe RoboHelp | Adobe | Windows | 4.4 out of 5 (41 review) |
| Microsoft Windows Help | Microsoft | Windows | 4.2 out of 5 (38 reviews) |
Convert to and from HPJ
Converting a HPJ file may not fully retain all functionality, but it is generally possible to return it to the original format.
Converting Files to HPJ Format
Effective solutions for HPJ file problems
If HPJ files are giving you trouble, small modifications to your software can help. Check out the troubleshooting tips below to fix these issues.
What are the possible solutions to recover a corrupt HPJ file?
Start a data recovery program and open the damaged HPJ file. Go to the menu and select the "Repair" option to repair the file. Allow the recovery process to complete, which will automatically repair the damaged blocked email attachment files.
Are there any symptoms that my HPJ file is damaged?
Corrupted HPJ blocked email attachment files may show the following signs:
- Opening the file in Microsoft Windows Help or other programs causes them to hang or crash;
- Error dialogs are displayed when interacting with the file;
- Opening the file results in an error or a failed attempt;
- Unexpected expansion of the total size of the HPJ file;
- Editing the archive in Microsoft Windows Help is accompanied by slow performance or delays;
What are the possible causes of Microsoft Windows Help crashing?
The absence of software updates can cause Microsoft Windows Help to crash. It is recommended to install the latest available updates for Microsoft products.
Restarting your computer can resolve numerous common problems, so it should be the initial step before changing any software-related settings.