In V11.5 and later, a feature prevents corruption and errors when an attempt is made to write to arbitrary offsets in a fixed-length file. Checks were added to ensure that a read/write/lock call on a fixed-length file is properly aligned. If an incorrect alignment is detected, the call will fail with FALG_ERR (767).
This feature can be disabled by keyword COMPATIBILITY NO_FIXED_OFFSET_CHECK.
Note: This is a Compatibility Change.