This file assigns the position for characters in party at the beginning of specified part of game.
The first column is filled by the identifiers of selected position feature. This indicates also what part of game uses these values like tutorial or normalgame.
First row contains numbers that indicate the number of party member.
Other rows contain of numbers that are coordinates described by identifier in first column.
In BG1 TotS we have:

2DA V1.0
0
           1          2          3          4          5          6
START_XPOS 1110       1059       1156       1013       1238       1277
START_YPOS 600        667        677        742        585        490