PAK (File Format)/Evolution Worlds

PAK is a container file format used in Evolution Worlds. PAK files may contain NEO, HSD, or other nested PAK files. The filenames of internal sub-files is not stored.

File Format

The file byte order is always big endian.

Header

The file starts with the following header:

Offset	Type	Description
0x00	UInt32	Number of entry table slots (S). The number of sub-files is S - 1, the last slot being a terminator.
0x04	UInt32[S]	Sub-file offsets.
0x04 + S * 4	UInt32[S]	Sub-file sizes in bytes, not including padding.

The header is padded with zeroes up to the next 0x20 byte boundary, so the first sub-file always starts at align(4 + 8 * S, 0x20), which is also the value of the first offset.

Terminator Slot

The last slot of both arrays does not describe a sub-file. It seems to repeat the first offset and has a size of 0 and none of the loader functions seem to read it, instead, the game derives the sub-file count by subtracting 1 from the slot count.

Sub-file Data

Sub-files are stored back to back in table order, each padded with zeroes to a multiple of 0x20 bytes, so that offset[i] = offset[i - 1] + align(size[i - 1], 0x20). The size of the whole PAK is therefore offset[n] + align(size[n], 0x20), where n is the last sub-file (and not the terminator slot).

Tools

The following tools can handle PAK files:

• (none)