: A .7z file can hold massive amounts of data; if the source is unknown, do not decompress it.
: The IRS never sends unsolicited emails with attachments. Official IRS tax instructions are typically hosted directly on IRS.gov as PDFs, not as .7z archives. taxInstructions.7z
Choose a destination folder and click . Note: The built-in Windows tool does not support password-protected .7z files. Windows (Older Versions or Password-Protected) You will need a third-party utility like 7-Zip . IRS tax forms and instructions in large print if the source is unknown