=> R1 = &42 (reason code)
R2 = filetype
<= R1 = 0 to claim (filetype known), preserved otherwise
R2 = first four characters, if known
R3 = last four characters, if known
This service is issued when a filetype lookup in the File$Type_### variable fails. You probably shouldn't be using this service as the system variables are more useful.
See PRM 1, page 263
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