Cp001.zip -

: The IRS uses "CP" prefixes for notices. While these are usually physical letters like CP01 (Identity Theft) or CP01A (IP PIN Assignment) , scammers often use these official-sounding codes in malicious email attachments to trick users into opening them. Security and Safety Review

: The extension .zip.001 (often mistaken for just .zip ) indicates the first part of a split file. You typically need all subsequent parts (e.g., CP002.zip , CP003.zip ) in the same folder to extract the full content. CP001.zip

If you have received this file unexpectedly, especially via email, you should treat it with extreme caution. Are Zip Files Safe to Open? : The IRS uses "CP" prefixes for notices