It's either ART or EXP. If you have the Explorations Software you can convert to either one.

I have that machine and it uses ART files.

G Maw, does your Avatar show the Henderson riverfront?
Maybe Owensboro?

I have a Bernina 730 and it uses ART files..if you find designs that aren't in ART..some places will make them ART files for you at know charge. I was told that if you use other files..that the machine can read them..but sometimes the designs don't stitch out as nice. I use Oregon Patchworks and Embroidery Mall. Once I purchased one set of designs at Embroidery Mall and it didn't come in ART files and they changed it for me.

have fun

it's normally .exp and when you are buying or downloading from website, download as the .exp. if you get involved with designing around embroidery design, changing it or adding something to it, and your finished working on it, forgive me if I can't remember the entire sequence, but if you need some help with the computer part of it and the working with the software, I "may" be able to offer small smaller bits of information. I have learned a bit more information on this then I thought I would. And if I can't help as much as needed I am sure there may be someone else within the group that can help you, or I can crank up my computer with the dongle key in it and get into one of my files to see if we can help each other along the way. Hope this helps a bit.. especially saving as the .exp format