What is .ECL file extension?
Game file used by Touhou games such as Double Spoiler and Ten Desires; contains a stage script, which provides the locations of enemies and the form of "danmaku patterns," which are the patterns of enemy bullets shot on the screen (e.g., spirals, circles, etc.).
Touhou games are vertical scrolling action games developed by Team Shanghai Alice.
NOTE: ECL scripts can be decompiled using Touhou Toolkit, a command line utility.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.