The file appears to be the first part of a multi-volume WinRAR archive. While there is no official documentation for this specific file name, the "solid" designation typically refers to a compression method where multiple files are treated as a single continuous data stream to improve efficiency [2].
: The .part1 suffix indicates that you need all subsequent parts (e.g., part2 , part3 ) in the same folder to extract the contents successfully.
To handle this file effectively, keep the following in mind: