File type: Partially Downloaded
The PART file extension pertains to the partial download of files or programs. Most download program managers or applications download a single file broken into smaller parts. All these parts come with the PART format.
A single file with this format is virtually useless as it's impossible to open it while the other files are still downloading. The user must wait for all the related PART files to be completely downloaded.
The user must also wait for the download manager to bring the separate pieces together as it is impossible for the user to combine these PART files manually.