Dear Bianca,
The .ps file is a postscript file storing the output of SPM's Graphics window. You can read those with e.g. Ghostscript.
To apply the estimated parameters onto other images (which makes sense only if they are in alignment with the soure image) you have to select those as "Other images" during the Coreg step, as indeed, no mat file is stored.
Best regards
Helmut
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