OPLM File Extension
Outline Processor Markup Language
- File Type oplm
- Popularity
- Application Notepad++
- Category Developer Files
What is a OPLM file?
Files with the OPLM extension are specifically tied to Outline Processor Markup Language, a Developer Files type, and there are 1166 files in this category.
OPLM files are compatible with various operating systems, including Windows, Mac OS and Linux. When working with OPLM files, you can rely on 5 programs, including Notepad++, TextEdit and Sublime Text.
MIME types
- text/xml
- text/x-opml
- application/xml
Programs that support OPLM files
How to open a OPLM file?
If you can’t open a OPLM 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.
Notepad++, TextEdit and Sublime Text are among the most widely used programs for handling OPLM files. To install the most up-to-date edition of Notepad++, visit the official Notepad++ Team website. You can download the build that works across all operating systems.
After installing, your OS should instantly open OPLM files with Notepad++.
Setting Notepad++ as default OPLM viewer
Change the default app for a file type in Mac
- Initiate a right click or use Control + left click on the desired OPLM file to open a menu where you can select various actions;
- Choose "Open in Application" and click "Other";
- Look towards the bottom of the window, where you will find the "Enable" menu. "Recommended programs" will be the default selection;
- Choose "All Programs" in this menu and search for Notepad++. Check the box next to "Always open in app" to set it as the default option.
Change default programs in Windows
- Take the first step by right-clicking on your OPLM file. Next, select "Open With" and then choose "Choose another app" from the available options;
- Choose Notepad++ from the available applications listed in the pop-up window to set it as the default application to open your OPLM file;
- Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.
Tips and tricks to solve problems with OPLM files
Problematic OPLM files can usually be resolved by making small changes in your software. See the tips below to help fix common issues.
Are there any techniques or tools available to repair a damaged OPLM file?
In a data recovery program, open the damaged OPLM file and select the "Repair" menu option. Wait for the recovery process to finish as it will automatically restore the damaged developer files.
How do I know if my OPLM file has been damaged?
The signs of corrupted OPLM developer files can manifest as:
- Error alerts occur when actions are performed on the file;
- The file shows slow performance when edited in Notepad++;
- The file encounters problems during the opening process or shows error indications;
- An unexplained increase in the size of the OPLM file;
- The file causes Notepad++ or other software to hang or crash during various operations;
What factors contribute to Notepad++ crash?
Lack of software updates is a possible reason behind Notepad++ crash. Keep your Notepad++ Team products up to date by installing the latest updates.
Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.
How to edit a OPLM file?
To modify OPLM files, it is necessary to install dedicated software that lets you open and edit developer files. Online OPLM editors generally offer fewer tools compared to programs designed for Outline Processor Markup Language.
Best OPLM editors 2026
Based on the specified criteria, here is a list of OPLM editors that may fit your requirements.
| OPLM Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| TextEdit | Apple | Mac OS | 4.8 out of 5 (40 reviews) |
| Gedit | GNOME | Linux | 4.6 out of 5 (38 reviews) |
| 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) |
| Windows Notepad | Microsoft | Windows | 4.2 out of 5 (37 reviews) |