!ERROR=54 - Open of File With Invalid Header
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Attempting to OPEN a file with an invalid header.
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Attempting to LOAD a protected program that was SAVEP'd with a different algorithm.
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A file was opened with MODE="CISAM" on a system that has intrinsic C-ISAM support, but the INFORMIX libraries are not installed.
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Running PRO/5 Rev. 3 and opening a 4 GB file.
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Running PRO/5 Rev. 2 and opening 64 bit file.
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Running PRO/5 Rev. 2 (does not support 4 GB files) and opening a 4 GB file.