File20465.7z.001 -

: The .001 extension indicates that there are likely subsequent files named file20465.7z.002 , file20465.7z.003 , and so on.

The filename refers to the first part of a split 7-Zip archive . file20465.7z.001

Filenames like file[numbers].7z are generic and often generated by automated scripts or bulk uploaders. If you did not intentionally download this from a trusted source, be cautious; generic archives from unknown origins can contain or unwanted software once extracted. file20465.7z.001