Hydraflow Storm Sewers Autocad Civil 3D not opening?

Beaudry

New member
I created a pipe network in Autocad Civil 3D 2010 and previously I have been able to export the file into an embedded program Hydraflow Storm Sewers to design and test the network I have created. I select the option export file or edit in storm sewers, then autocad is supposed to save the file as a .stm file and open Hydraflow automatically. I did this as recently as 2 days ago. Today i go to export the file, I save it as a .stm but then hydraflow does not open. I go into the save folder and it says it is an html document when i clearly selected the .stm file name. i cannot find an executable file for hydraflow either. any ideas why hydraflow is not opening and my files are not working?
 
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