7-Zip-FL2 is a fork of mainline 7-Zip which uses the Fast LZMA2 Library as the default compressor.
7-Zip-FL2 adds a new matchfinder option, -mmf=RMF, provided by the Fast LZMA2 library. RMF is the default for LZMA2 in this version. To use the other matchfinders in the console version, specify -mmf=HC4 (level 1 - 4) or -mmf=BT4 (level 5+) on the command line.
The help file in this release has not been updated with information about RMF.
The command-line version has been subjected to automated testing on sets of files chosen at random. The FL2 component has passed heavy fuzz testing. Even so, this software has no warranty and both 7-Zip 18.01 and FL2 0.9.0 are beta versions.