The level files are set out like this. All values are little endian (least 
important bytes come first):

The first byte is the number of letters in the background bitmap name.

The followed by the name of the bitmap used for the background. Max of 100 characters.

The byte next should be null.

The next WORD (two bytes) is the number of 'objects' there are. Those are the 
coords you cannot walk through.

The next byte is the number of 'hotspots', or the places that warp you to another 
location.

Next is the # of objects of this:
WORD x; //The x coord of the object
WORD y; //The y coordinate
WORD width; //The width
WORD height; //the height
BYTE type; //Type. 1 = square, 2 = slanted left, 3 = slanted right.

Next is the # of hotspots of this:
WORD x; //x coord of the hotspot
WORD y; //y coord of the hotspot
WORD width; //the width
WORD height; //the height
BYTE type; //type. Same as object types.
BYTE mapnum; //Which map it will warp you to
WORD warpx; //the x location on the map you warp to you will appear at
WORD warpy; //the y location on the map you warp to you will appear at


For the 'mapnum' the maps are 
0 "levels\\maps\\main.lvl"
1 "levels\\maps\\drugstore.lvl"
2 "levels\\maps\\burger.lvl"
3 "levels\\maps\\townhall.lvl"
4 "levels\\maps\\arcade.lvl"
5 "levels\\maps\\hospital.lvl"
6 "levels\\maps\\arcade2.lvl"
7 "levels\\maps\\townhall2.lvl"
8 "levels\\maps\\townhall3.lvl"
9 "levels\\maps\\mayoroffice.lvl"

Those are the indexed map file names. So all map names have to be that... unless 
you just recompile it and stuff... which you can... if you feel like it... because 
it comes packaged with the source.