Thanks for your help!
But that's the problem! I've passed hours to search what could differ in the options between my pro and my free version, and I've checked all the settings that may concern the aspect ratio... but the behavior is still not the same, even with the same configuration file! (I've copied my old BSplayer.xml in my C:\Documents and Settings\my_user_account\Application Data\BSplayer Pro directory, and:
->when I play the 4:3 tagged mpg file in the free version, the file is correctly displayed (with the right and left black stripes, and the possibility to display a letterbox 4:3 video at full width by pushing the "m" key
->when I play a 4:3 tagged mpg file in the pro version, (with extended attributes reading enabled , so bsplayer should detect the file aspect ratio as 4:3) the file is (most of the time) directly displayed as letterbox, in the full width of the screen with the top and bottom hidden. I must push the O "auto pan-scan" key and the file is (most of the time) correctly displayed.
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