An AGPA chunk lists fonts used in a textbox

Length: varies
00: ChunkSignature (4 bytes)
04: Number of fonts (4 bytes)
08: offset/length of some sort (4 bytes)

from end of file, number of fonts * 8:

00: offset of font selector(from offset 20 in the file)
04: length

font selectors:
08: unknown (03 03 03 03)
0C: length of font name (1 byte)
0D: font bytes