This file is almost certainly a compressed data file (part 6 of many) and cannot be opened or read as an essay document (like a .doc, .pdf, or .txt file).
To access the content, you must have all the other parts (e.g., .part01.rar, .part02.rar, etc.) in the same folder and use a file archiver tool like WinRAR or 7-Zip to extract them. 1900WDL.part06.rar
If this file is related to a specific project, assignment, or software, you will need to download the remaining parts to decompress the final content. This file is almost certainly a compressed data
.