Are you getting a specific when trying to open it? Do you have all 20 parts downloaded?
This file is the third installment of a large collection that has been split into smaller, manageable chunks (likely 20 parts total, based on the 0001-0020 naming convention) [1]. 0001-0020.part3.rar
Here is an informative look into what that file represents and how it is used. The Anatomy of "0001-0020.part3.rar" Are you getting a specific when trying to open it
Splitting files is used to overcome file size limits on file-hosting sites, speed up downloads (by allowing parallel downloads), or make it easier to transfer large amounts of data, such as high-definition videos, software packages, or backups [2]. Here is an informative look into what that
It seems you're asking about the file . This filename structure is a classic indicator of a multi-part archive created with WinRAR [1].