HLP File Extension
Windows Help Format
- File Type hlp
- Developer Microsoft
- Popularity
- Application Microsoft Windows Help
- Category System Files
- Format Binary
What is a HLP file?
The HLP file extension is linked to Windows Help Format and belongs to the System Files category, which includes 251 files.
The Windows Help Format (HLP), created by Microsoft, is one of file format they developed, and they also built 242 programs to support them.
HLP files are supported by Windows. When working with HLP files, you can rely on 5 programs, including Microsoft Windows Help, Microsoft Windows and Adobe RoboHelp.
Programs that support HLP files
How to open a HLP file?
If you can’t open a HLP file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
The most popular programs for working with HLP files are Microsoft Windows Help, Microsoft Windows and Adobe RoboHelp. To install the latest version of Microsoft Windows Help on your computer, visit the Microsoft website where you can download the version available for all operating systems.
Following installation, HLP files should be automatically opened with Microsoft Windows Help.
Set Microsoft Windows Help as your default HLP viewer
Changing the default program in Windows
- Right-click on your HLP file, then choose the "Open with" option and select "Choose another application" from the available options;
- From the list of applications in the pop-up window, find and select Microsoft Windows Help as your desired application;
- Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening HLP files.
Set default app to open files on Mac
- Right-click or Control + left-click on the desired HLP file to open a menu of available actions;
- Select "Open in application" and click "Other";
- Look at the bottom of the window, where you will see the "Enable" menu. "Recommended Programs" will be selected as the default option;
- Within this menu select "All Programs" and navigate to Microsoft Windows Help. Check the box next to "Always open in app" to make sure it’s the default option.
Convert to and from HLP
If you have trouble working with a HLP file, try converting it to HPJ or similar system files.
Please note that after converting a HLP file, some functionality may differ from the original. However, in many cases, it can be converted back to its original format.
Convert HLP to other file formats
Solving Common HLP File Challenges
When issues arise with HLP files, they can generally be fixed with small software tweaks. Use the troubleshooting tips below to help resolve them.
What are the warning signs that my HLP file may be corrupted?
Corrupted HLP system files may have one or more of the following symptoms:
- Error messages appear during the course of working with the file;
- Poor performance when editing a file in Microsoft Windows Help;
- Attempts to open the file result in errors or failed results;
- Unexplained increase in HLP file size;
- The file causes Microsoft Windows Help or other programs to hang or crash during operation;
Why does Microsoft Windows Help crash?
Microsoft Windows Help crashes can be caused by outdated software. Keep your Microsoft products up to date by installing the latest updates.
A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.
How to repair a corrupted HLP file?
Use a data recovery program to open the damaged HLP file and from the menu choose "Repair" function to start the repair process. Please be patient while the recovery process completes, which will automatically restore the damaged system files.
How to edit a HLP file?
To edit HLP files, you need to install specialized software that allows you not only to open but also to modify system files. Online HLP editors usually provide fewer features than software created specifically for Windows Help Format.
Best HLP editors in 2026
Taking into account the provided details, we have prepared a list of HLP editors that match your needs.
| HLP 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) |