I usually delete them, didn't know what they were for and my memory card seems to work fine when I use any of the designs without having it.
They are information files required by certain programs to reproduce the associated design correctly. (especially Pulse programs)
I haven't noticed anything detrimental when I have deleted them, other than the next time you access the design with that particular program, it will create them again anyway.
May as well just leave them.
Hugs n roses, Meganne
Thank you Meganne - I also wondered what they were for. I also just delete them!!
Thank you for this nugget of technical information! The problem I've had is that, as they are mostly invisible, they remain on the memory card I use with my machine after I've deleted the embroidery design. This seems to slow down the reading of the card.