Large video files, game installers, or software backups are often split into smaller .7z.### pieces to make them easier to upload or store. The "acwp" prefix could be a shorthand for a specific title, project name, or user handle.
Do you have the (like .002 or .003) for this archive, or are you trying to identify where the file came from? acwp.7z.001
If you don't recognize the name, it is possible this is an encrypted container. Note that you cannot open a .001 file alone; you need the full sequence to "rebuild" the original file. Large video files, game installers, or software backups