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Since .7z is a compressed format, you cannot simply rename it to .pdf or .docx . You must use a specialized tool:

Archives named with specific alphanumeric strings (like jh26974 ) are often found in:

: Researchers frequently bundle manuscripts, source code, and raw data into a single .7z or .tar.gz file for sharing on platforms like PubMed or Data.gov .

Once you extract the file, look for a .pdf or .docx file inside, which would be the actual research paper or document you are seeking.

: Some journals require authors to upload their full "paper package" (figures, tables, and text) as a compressed archive.

To access the "proper paper" or documents inside, you will need to extract the contents using an archiver that supports the .7z extension. How to Open the File