how do i reskin wheels on k&l trainz models

so im reskining the k&l trainz o5b into its gold scheme but i cant find the wheels the olny files the kinda have the word on them are 2 files cb_q-484-near and cb_q-484-far and they are im files and every time i try to edit i files in paint.net it always show up with this error saying image type not recognized and cannot be opened so how do i edit the wheels along with the cowcatcher thing and cylender and valve gear
 
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