It does not contain a full file on its own. It is the third "slice" of a larger original file that was split to meet upload limits or for easier distribution.
The prefix appears to be a unique stock-keeping unit (SKU), a part number, or a release ID. sc23559-TEC.part3.rar
The suffix frequently denotes "Technical" content. This file is likely the third segment of a large technical data package, such as: It does not contain a full file on its own
To extract the contents, you must have all other parts (e.g., part1, part2, etc.) in the same folder. a part number