On a Windows PC, I learned by opening My Computer, then the C: drive, then the game folder, then the bmp folder, and selecting "thumbnails" from the "views" list.
Then I scrolled down the page looking at all the pictures.
PBs are in the 300s, buildings in the 6000s, uniforms 9000s, and so on.
Winter uniforms are 59000s like AFVs but buildings throw a curve. Summer 6000s, damaged 6100s, winter 6500, damaged 6600.
PBs winter CMBO started with 340 and winter 10340 but CMBB and CMAK went to 50340 but the last CMAK patch put them back to 10340. For CMAK only. Confused??? If you find a CMAK PB mod from before the patch, you must renumber the 50340s to 10340s.
CMAK desert starts with 30000 so buildings are 36000s, PBs 30340s.
In the 1200s you will find all kinds of goodies.