PowerPunch v1.1 understands the following stitch file formats;

Tajima DST

Brother PES

Brother PEC

Janome SEW

Janome JEF

Melco EXP

Zeng DSZ

Barudan DSB

Toyota 10o

Happy TAP

Wilcom T01

Wilcom T03

Wilcom T04

Wilcom T05

Barudan U01

Tajima TBF

Inbro INB

Elna EMD

Pfaff KSM*

*Pfaff KSM format support is provisional. Watch this space! More formats to come...