Part 2 of a compressed archive created by 7-Zip, a free file compression program; stores one part of a spanned archive, which breaks a .7Z file into multiple parts (other parts use the .7Z.001, ".7z.003," etc. extensions); used for breaking a 7Z file into smaller pieces for download, storage on external media, or sending over email.
In order to decompress a 7-Zip split archive, you must first obtain all the parts so that 7-Zip can reconstruct the 7Z file. Once reconstructed, 7-Zip can then decompress the 7Z file in to extract the files.
NOTE: 7Z.002 files use a compound extension, which uses both .7Z and .002 extensions.