This file is typically part of a multi-volume RAR archive. Multi-volume archives are used to split large software installers into smaller, more manageable pieces (e.g., Part 1, Part 2). Software Association
Data distributors split files into multi-part (or spanned) RAR archives for several practical reasons:
is typically provided only after the user's research credentials have been verified by the hosting institution. It is rarely public to protect sensitive patient information. Integrity Check
: This suggests that the data is split into at least two files (e.g., ...part1.rar and ...part2.rar ).
: This is a popular, free, and open-source alternative that also handles RAR files.