Fast File Saw and Joiner is a free Windows utility tool developed by K-werkx, falling under the category of File Managers. When dealing with large files for emailing or archiving, this program comes in handy by slicing them into smaller segments and reassembling them effortlessly. The user interface presents two main tabs: Join File Pieces and Saw File. While the controls for configuring the piece size may not be very intuitive, our tests revealed that the program effectively splits and merges a 1GB file without causing any system overload.

However, Fast File Saw and Joiner lacks the capability to create self-joining packages, necessitating recipients to have the program installed as well. In comparison to more popular archive tools like WinZip that also offer file splitting and merging functionalities, it's challenging to advocate for the exclusive use of Fast File Saw and Joiner. Nonetheless, for quick file splitting tasks, this program serves its purpose well. For more frequent usage, opting for a comprehensive archive package might be more suitable.