CP/M files do not have headers.
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==== Random File Access ====
One of the major computing flaws of the Amstrad CPC machines has been the inability to handle simple Random Access Filing even when equipped with disc drives. [https://cpcrulez.fr/applications_bureau-random_accesss_database.htm Source]
The only way random access data handling was possible was if the program was written entirely in CP/M.
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