.IFL File Extension
What is an IFL file?
File created by 3ds Max, a 3D modeling and animation application; stores a sequence of image filenames in plain text; used for including single-frame bitmaps in a series of rendered frames; also used for generating animated bitmaps.
IFL files may include an optional number following each filename that specifies the number of frames to use the image for. In some versions of 3ds Max, an IFL file may also contain other IFL files in its list.