Angle-resolved photoelectron spectra have been measured at room temperature (i.e. well below the Curie temperature) from the (001) surface of an Fe₃Pt single crystal for a variety of emission angles using unpolarised 21.2 eV radiation. Corresponding spectra were calculated by means of a one-step theory of photoemission together with the bulk band structure and the one-dimensional DOS. The fairly good overall agreement reached between theory and experiment firstly provides an explanation of the observed features in terms of direct bulk inter-band transitions from majority and minority spin states and secondly favours, amongst local density exchange-correlation approximations, an X_alpha version with alpha =0.7 around 2 eV below E_F and a somewhat smaller alpha closer to E_F.