The "Part-4" designation typically signifies a split archive . Large files are often broken into smaller segments (Part-1, Part-2, etc.) to bypass upload limits on hosting sites. All parts are usually required to successfully extract the full content. 2. Potential Content Associations
The .zip extension indicates a compressed archive used to store multiple files or large datasets in a smaller format to facilitate sharing. Part-4 (mmsking)zip
For example, was it on a forum , a software site , or a social media platform ? The "Part-4" designation typically signifies a split archive