LZMA_Alone, also known as .lzma format, is a compressed file format that uses LZMA compression. It is sometimes simply called LZMA or lzma, but that can be misleading, because "LZMA" more commonly means the raw LZMA compressed data format.
LZMA_Alone files have a 13-byte header.
There is no signature, and no simple way to identify LZMA_Alone files just by looking at the header. That said, it is common for them to start with bytes
5D 00 00.
lzmainfo utility from XZ Utils can help with identification.
- XZ Utils source → doc/lzma-file-format.txt