: If part .001 through .004 are missing, you cannot open part .005 alone. You must download or locate the missing segments.

The file is the fifth part of a split 7-Zip archive. To access its contents, you must have all parts (001, 002, 003, etc.) in the same folder and use the first part to begin the extraction . How to Extract the Archive

: Right-click the .001 file and select "Extract files...".

on the first file in the sequence (ending in .7z.001 ).