  We have detected weak soft X-ray emission from the Pulsar Wind Nebula
trailing the high velocity star PSR 2224+65 (the `Guitar Nebula'). This X-ray
flux gives evidence of \gamma~10^7 eV particles in the pulsar wind and
constrains the properties of the post-shock flow. The X-ray emission is most
easily understood if the shocked pulsar wind is partly confined in the nebula
and if magnetic fields in this zone can grow to near equipartition values.
