Vanilla & Burning Crusade screenshot filename format

Hey guys, wondering if anyone could help me out. I've been trying to search my computer / backups for old screenshots - the earliest I have in my wow folder is only from wotlk era, which just have the file format of 'WoWScrnShot_DDMMYY_HHMMSS.jpg' - and I'm trying to find out if earlier screenshots from vanilla & tbc time had a different filenames, or if they followed the same format. Would anyone have any screenshots from that far back they could check for me? Thanks!