Changes
| 18 || File type || 0:BASIC 1:Protected 2:Binary (ASCII files don't have headers but a fake header is built in memory with the file type #16, "Unprotected ASCII v1")
|-
| 19..20 || Data length || As per cassetteThe number of data bytes in the data record
|-
| 21..22 || Data location || As per cassetteWhere the data was written from originally
|-
| 23 || First block || Set to #FF, only used for output files
| 24..25 || Logical length || Actual file length is here
|-
| 26..27 || Entry address || As per cassetteThe execution address for machine code programs
|-
| 28..63 || Unused ||
