There can be multiple causes why you have problems with opening FDL files on given system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files. Files with FDL extension, just like any other file formats, can be found on any operating system. Programs that can handle FDL files are as follows. Programs which support FDL file extension On the official website of Corel Corporation developer not only will you find detailed information about theCorel Paradox software, but also about FDL and other supported file formats. The most popular program for handling FDL files is Corel Paradox, but users can choose among 1 different programs that support this file format. FDL file format, along with 403 other file formats, belongs to the Database Files category. FDL file format is compatible with software that can be installed on Windows system platform. Corel Paradox Secondary Index specification was created by Corel Corporation. FDL filename suffix is mostly used for Corel Paradox Secondary Index files.