Found one file extension association related to Free Lossless Image Format (FLIF) and 1 file format developed specifically for use with Free Lossless Image Format (FLIF).
FLIF is a lossless image format based on MANIAC compression. MANIAC (Meta-Adaptive Near-zero Integer Arithmetic Coding) is a variant of CABAC (context-adaptive binary arithmetic coding), where the contexts are nodes of decision trees which are dynamically learned at encode time.
If you need more information please contact the developers of Free Lossless Image Format (FLIF) (Jon Sneyers), or check out their product website.