Maybe Singer have had more different embroidery formats than other manufactures..!

xxx, psw, csd, che and fhe Singer embroidery formats have their own profile settings that determine how embroidery information will be interpreted when you save design files or send design files to a machine. When you use the correct machine format, the design information displays accurately on the screen and designs are sewn correctly on a embroidery machine.

Designs somtimes called patterns are created by a technique called digitizing. There are particular file extension names that apply to the different brands of machine.

For example the design called floral.xxx would be for a Singer, because Singer uses the file extension xxx. If you are not sure what file extension you can use, see your instruction book or follow the guide below.

The New Singer Futura range, eg, CE150, CE200, CE250, CE350, XL-400 uses .FHE embroidery format and also CHE (Compucon) design format - however the Singer embroidery software that comes as standard with many Singer Futura will automatically convert the following embroidery formats,
XXX
PSW
PEC
PES
HUS
SEW
EXP
DST
PCS, FHE and CHE, purchase any of the above formats is fine.

However Singer's most usable format is .XXX

Singer XL5000 and XL6000 use the format with the file extension .XXX

Singer's software called "Singer PSW" a hardware and digitizing software package will load and save in many different formats but buying .XXX you'll be safe.

Older machines like the Singer Quantum XL-100, XL-150, XL-1000 use .XXX format