12 3D DA - header;
01/00 - type of file;
4 next bytes = unknown yet;
8 bytes = size of used part of file (adding to this number 16, increasing to nearest number, which divide on 16, and this is real filesystem size)

1byte = some flag; (in filetype 01 there are three of these flags: FF,FD,FB)
2 bytes = count of pointers with offsets (could be 1 byte instead of two, maybe there are resemblance with previous flag)
3 bytes = another header, common for many files;
1 byte = unknown;
After that, starts pointer table with such structure:
[2 bytes offset][2 bytes pointer] FF (delimeter)
[2 bytes offset][2 bytes pointer][2 bytes offset][2 bytes pointer] FF (delimeter)
....
[2 bytes offset][2 bytes pointer][2 bytes offset][2 bytes pointer] FF (delimeter)
[2 bytes offset][2 bytes pointer] (can be leading 00 00)

Count of pointers and offsets can be even, so table will ends after FF.

Text starts in point 16 + (count of pointers with offsets)*9/2