.lzma

An LZMA file is a file archive compressed using LZMA compression. It may contain one or more files that have been saved in a compressed archive format.

LZMA stands for the "Lempel-Ziv-Markov chain Algorithm," a compression method that improves upon the LZ77 algorithm. LZMA compression is incorporated by multiple file compression utilities, though each program may save compressed files in different proprietary formats.