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If you wish to find the codepage (CCSID) used by the System21 AIP file then this is what you can do.
First find the library where the System21 AIP file API32 resides.
WRKOBJ OBJ(*ALLUSR/AIP32) OBJTYPE(*FILE)
Now that you know the library name you can display the File Field Descriptors for AIP32 e.g.
DSPFFD FILE(AULT2F3/AIP32) - where AULT2F3 is the library where your AIP32 file resides.
Page down and you will see the CCSID e.g.