This is often an acronym or a specific username/handle used by a content creator. In many online contexts, "wcm" can stand for "webcam" or "with cam," suggesting the file contains video or media logs.
This is a WinRAR compressed archive. Files ending in .part3.rar are part of a split archive , meaning the original content was too large for a single upload and was divided into multiple segments. To extract the data, you generally need all parts (Part 1, Part 2, etc.) in the same folder.
These specific naming patterns are frequently associated with archived media collections, social media backups, or premium creator content shared via third-party hosting sites like Mega.nz or MediaFire.