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 IWD2 we have:

2DA V1.0
0
                        1       2       3       4       5       6
START_XPOS              2414    2321    2383    2383    2351    2330
START_YPOS              897     926     931     867     894     851
START_XPOS_EXPANSION    1021    0958    1085    0950    1018    1071
START_YPOS_EXPANSION    2519    2510    2512    2540    2548    2542
START_ROT               12      12      12      12      12      12
START_ROT_EXPANSION     0       0       0       0       0       0