The RDL file extension is associated with Paradox, a relational database management system sold by Corel Corporation, which is part of some editions of Corel WordPerfect Office suite.
Vector-based drawing format used by Bentley Microstation; saved as a "reference attachment" and is displayed with an active model, such as a .DGN or .DWG file; used for plotting or construction purposes. RDL files typically have a similar name as the corresponding model they reference and should be saved in the same folder.
RDL is an XML application primarily used with Microsoft SQL Server Reporting Services. RDL is usually written using Visual Studio, although there are also third-party tools; it may also be created or edited by hand in a text editor. Microsoft Reporting Services or other 3rd party reporting frameworks use RDL to define charts, graphs, calculations, text, images (through links) and other report objects and render them in a variety of formats
File extension is used by computer game Descent.
File extension is used by Symbian. Recogniser library.
Now Pirate Radio.
The RDL file suffix is associated with the Bentley MicroStation. File contains vector redline image.