: Since it is a .rar archive, you must use software like WinRAR or 7-Zip to open it. The "proper paper" (likely a PDF or Word document) is almost certainly inside the archive itself.
Could you provide more context on or what subject it relates to? This would help in identifying the specific document or institution it belongs to.
The identifier appears to be a specific compressed file name, likely from a proprietary database, an internal university system, or a government tax/legal filing portal (common in regions like Spain where identifiers often end with a letter).
A password will be e-mailed to you