.mdb database
.des where all the IRRICAD stuff in the design is stored e.g., pipes, valve etc.
.vcd the VisualCadd side of things e.g., pipes are pink lines
.dem the digital elevation model file
.dml mainline design
.dzf zone design configuration file
.dzn zone design file
.stn where the system flows assigned to zones information is stored
.wsp where the water supply data is stored
.zne zone file
.ztm zone times file
.cer costing error file