: Similar to malware.txt or scanreport.txt used by hosting providers like Bluehost, this could be a report generated after a security tool has "checked" a system or directory for vulnerabilities.
: The prefix "checked" suggests this file contains the results of a validation process. The "2_0" typically denotes a version number (v2.0) or a specific run instance. It might be used to track which items in a list have been processed or verified. checked2_0.txt
Knowing where you found this file (e.g., a specific GitHub repository, a server directory, or a homework assignment) would help in providing a more precise write-up. : Similar to malware