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The TRN file format is quite similar to MDB format.

Source: https://neverwintervault.org/project/nwn2/other/trn-fileformat

Header struct (12 bytes)

Type	Name	Description
`char[4]`	`file_type`	Always `NWN2`
`uint16_t`	`version_major`
`uint16_t`	`version_minor`
`uint32_t`	`packet_count`	Number of packets

PacketKeyTable struct (8 bytes)

Type	Name	Description
`char[4]`	`type`	Packet type name
`uint32_t`	`offset`	Byte offset of the packet from the beginning of the file

Packet struct (variable length)

Type	Name	Description
`char[4]`	`type`	Packet type name
`uint32_t`	`size`	Packet data size in bytes
`uint8_t[size]`	`data`	Packet data

Each packet contains different data depending on their type

Packet types

There are 4 types of packets:

```
TRWH: Terrain Width Height info
```
```
TRRN: Terrain geometry info
```

ASWM: Walkmesh geometry & pathfinding data

```
WATR: Water geometry info
```

Source: https://neverwintervault.org/project/nwn2/other/trn-fileformat