.FDL file extension
This is the basic program to work with .FDL extension
.FDL extension is also supported by the following programs:
FlashDevelop Layout File
FlashDevelop is an open source code editor for ActionScript and Haxe development.
Furcadia Dream Link
Furcardia is a F2P (free to play) massively multiplayer online game.
Paradox Runtime lets you view, enter, and edit database records.
It analyzes and catches design errors in success and failure scenarios.