HTMLS File Extension
HyperText Markup Language Document With Server-side Include
- File Type htmls
- Popularity
- Application Notepad++
- Category Text Files, Web Files
What is a HTMLS file?
The HTMLS file extension is linked to HyperText Markup Language Document With Server-side Include and belongs to the categories of Text Files and Web Files, which include 598 files.
HTMLS files are supported by Windows, Linux and Mac OS. To open a HTMLS file, you can choose from 6 programs such as Notepad++, Sublime Text and Firefox.
Programs that support HTMLS files
How to open a HTMLS file?
If you cannot open a HTMLS file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.
Notepad++, Sublime Text and Firefox stand out as the preferred programs to manage HTMLS files effectively. To install the current version of Notepad++, go directly to the official Notepad++ Team website. The universal package for all operating systems is available there.
After successful installation, your operating system should seamlessly handle HTMLS files via Notepad++.
Set Notepad++ as the default HTMLS program
Change Default Program on Mac
- Right click or Control + left click on the desired HTMLS file;
- Choose "Open in Application" and click "Other";
- Go to the lower section of the window, where you will find the "Enable" menu. By default, it is set to "Recommended Programs";
- Select "All Programs" from this menu and proceed to search for Notepad++. Check the box next to "Always open in app" to set it as the default option.
Set default programs for Windows
- Start by right-clicking on your HTMLS file, then select the "Open with" option and choose "Choose another app" from the menu that appears;
- In the pop-up window, select the Notepad++ application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening HTMLS files.
Solve problems with HTMLS files
HTMLS files may present some challenges, but most can be easily addressed with minor software tweaks. See the troubleshooting tips below for guidance.
What are the ways to check if my HTMLS file is damaged?
HTMLS text files that have become corrupted may display one or more of the following symptoms:
- The file does not respond or shows errors when opening it;
- The file exhibits poor performance during editing operations in Adobe Dreamweaver;
- The file stops responding or freezes in Notepad++ or other programs;
- Unexplained HTMLS file size inflation;
- Actions performed on the file result in the appearance of error notifications;
Why does Notepad++ crash or shut down frequently?
Insufficient updates for Notepad++ Team products can cause Notepad++ to crash. Be sure to regularly install the latest software updates.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.
Is there any specific software or utility that can help repair a damaged HTMLS file?
Use a recovery program to open the damaged HTMLS file, and in the menu, click "Repair" to start the repair operation. Wait for the recovery process to finish, allowing automatic repair of damaged text files.
How to edit a HTMLS file?
To make changes to HTMLS files, you need specialized software that allows both opening and editing the text files. Online HTMLS editors offer fewer capabilities than applications optimized for HyperText Markup Language Document With Server-side Include.
Best HTMLS Editor Software in 2026
With the mentioned criteria in mind, we have assembled a selection of HTMLS editors.
| HTMLS Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Notepad++ | Notepad++ Team | Windows | 4.6 out of 5 (37 reviews) |
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.6 out of 5 (39 reviews) |
| Adobe Dreamweaver | Adobe | Windows, Mac OS | 4.5 out of 5 (38 reviews) |