FDL File Extension

FDL file icon

Corel Paradox Secondary Index

What is a FDL file?

The FDL extension is related to Corel Paradox Secondary Index and is classified in the Data Files category, which contains 6196 files.

The Corel Paradox Secondary Index (FDL), created by Corel, is one of file format they developed, and they also built 27 programs to support them.

FDL file support extends to various operating systems, including Windows. When working with FDL files, you can rely on 2 programs, including Corel Paradox and WordPerfect Office.

Programs that support FDL files

How to open a FDL file?

If you can’t open a FDL 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.

Thanks to their popularity, Corel Paradox and WordPerfect Office are often the go-to programs for managing FDL files. If you need the newest version of Corel Paradox, just access the Corel website. From there you can download the installer compatible with all systems.

Once setup is done, your operating system should assign Corel Paradox as the default app for FDL files.

Set Corel Paradox as the default FDL handler

Choose an app to open a file on Mac

  1. Right click or use Control + left click on the desired FDL file to launch the file options menu;
  2. Choose "Open in Application" and click "Other";
  3. Scroll down to the bottom of the window, where you will find the "Enable" menu. Default, "Recommended Programs" will be selected;
  4. In this menu, choose "All Programs" and navigate to Corel Paradox. Check the box next to "Always open in app" to make it the default program.

Change a default app in Windows

  1. Take the first step by right-clicking on your FDL file. Next, select "Open With" and then choose "Choose another app" from the available options;
  2. In the pop-up window, find and select the Corel Paradox application from the available options;
  3. Make sure the "Always use this app" checkbox is checked and click "OK" to confirm your choice as the default app for opening FDL files.

Effective solutions for FDL file problems

If you encounter issues with FDL files, don’t worry—most can be fixed with minor software adjustments. Refer to the troubleshooting tips below.

What can lead to sudden Corel Paradox crashes?

Lack of software updates is a possible reason behind Corel Paradox crash. Keep your Corel products up to date by installing the latest updates.

Restarting your computer can resolve numerous common problems, so it should be the initial step before changing any software-related settings.

What is the recommended approach to repair a damaged FDL file?

In a data recovery program, open the damaged FDL file and select the "Repair" menu option. Wait for the recovery process to finish, allowing automatic repair of damaged data files.

How do I know if my FDL file has been damaged?

Characteristics of corrupted FDL data files can include:

  • Error alerts occur when actions are performed on the file;
  • Editing the archive in Corel Paradox is hampered by poor overall performance;
  • The file does not respond or shows errors when opening it;
  • Unexplained FDL file size inflation;
  • The file stops responding or freezes in Corel Paradox or other programs;

How to edit a FDL file?

To modify FDL files, you need to install special software that makes it possible to open and edit data files. Online FDL editors are more restricted compared to software designed for Corel Paradox Secondary Index.

Best FDL Editor Software in 2026

Following these criteria, we have put together a list of recommended FDL editors.

FDL Editor SoftwareDeveloperPlatformsOverall Rating
Corel ParadoxCorelWindows4.3 out of 5 (39 reviews)