Did you know that the Buzz Tools customizing programs save to different versions of the PES format? If you are asking what does this mean, it is important if you have a PES file that will not open into your PED Basic or other software. Of course the most current native PES software (Palette or PE Design) support the various versions but other programs you use may not.
Please be aware that this will "lock" the design to a stitch file - that is any objects created in the design by the native program will not be saved. All the stitches will be there, but if there were any objects created and saved by the native PES software, they will not be able to be edited in that PES software as objects.