: By default, these files use the LZMA (Lempel-Ziv-Markov chain algorithm) method, which typically provides a significantly higher compression ratio (30–70% better) than the standard ZIP format.
: The format supports strong AES-256 bit encryption , allowing you to password-protect the contents and even encrypt the filenames within the archive. DCL01.7z
If you see other files like DCL02.7z or DCL01.7z.001 in the same folder, this is a multi-part archive . You must have all parts present in the same directory to successfully extract the data. : By default, these files use the LZMA