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TXTCONV <file>,<converted_file> 
CONVERSIONS:
B  <first_byte> <record_length> "string"
END

is a special form of TXTCONV mainly for converting files where
fixed-length records have no delimiters.
Thus the TXTCONV operation above makes from <file> a <converted_file> by
cancelling <first_byte> first characters and copying records as such but
ending each record by extra characters given as "string".
This type of conversion facilitates saving of non-standard text files in
Survo data files by FILE SAVE.

For example,
B 139 48 "char(13)char(10)"

cancels bytes 0,1,2,...,138 from the beginning of <file>,
copies records of length 48, and adds CR and LF characters
at the end of each record.

Use CODES LOAD <file> / BYTES=<integer> 
for detecting the starting position and the record length
in <file>.