In the "detailled search" function you can filter on the file formats, as for example an MusicXML:
musicalion.com/de/scores/notes/composition/find?cn=&d=&e=&ft=9&ie=&ii=1&i=&ma=&a=&s=&t=&cntr=&intr=&fvr=&rprt=&dnl=&content=

it is the last chapter on the left option boxes.