THE STRUCTURE OF A DAT FILE
Chapter 2 - The head
Part 1 - Start

The first image shows the beginning of part 1, the second image the end of it.

Colour	Meaning
41 50 47 49	extension of the file (APGI)
08 00 00 00	start number + all file sizes of the files before (8, because this is the first file, so you can find here only the start number; the start number is always 8)
00 00 00 00	sum of the name lenght of all named files before (0); if this file isn't named, this field is always zero *
40 00 00 00	file size (64 bytes)
01 00 10 00	file indentification **
and so on...
9C 02 00 00	already the beginning of part 2

*)	To see, what the name lenght is, look at chapter 4.
**)	There are four different identification numbers in Oni:

Number	Meaning
01 00 10 00	not shared unnamed files (only one file link to this file)
09 00 10 00	shared unnamed files (more than one file link to this file)
00 00 30 00	named files
02 00 00 00	zero byte files (that means that Oni takes the information from level 0)

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