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Thanks to Ricardo Lopes for this image.
ACE tape file format
Jupiter ACE Tape Header


An ACE tape header contains 25 bytes and contains the following:

1    byte file type 0 for Dictionary 32* for bytes
10  bytes filename padded with spaces
2    bytes length of file
2    bytes start address. This is 15441 for a dictionary
2    bytes current word. Unused for bytes file
2    bytes value of system var CURRENT [Address hex 3C31, dec 15409]. Unused* for bytes file
2    bytes value of system var CONTEXT [Address hex 3C33, dec 15411]. Unused* for bytes file
2    bytes value of system var VOCLNK [Adress hex 3C35, dec 15413]. Unused* for bytes file
2    bytes value of system var STKBOT [Adress hex 3C37, dec 15415]. Unused* for bytes file

*Filetype for bytes file may be any non zero value.
*Unused bytes are filled with spaces.