Unable to access file???

[aborruso at spaziogis.it]

Dear mapserver users,
I have begun to use mapserver few days ago. I have installed it on windows 
Nt machine and It seems to work, but I'm not be able to view a very simple 
map. I have begun to write a simple map file and then I have put this 
string in my web browser (IE 5): http://easyms/cgi-bin/mapserv.exe?map=/ms_demo/prova.map&mode=map.
The result is: msLoadMap(): Unable to access file. (/prova.map) 
        I have used the Path, relative to the CGI directory, but I have no 
result.
        This is my map file:

        NAME EX1 
EXTENT 74000 4775000 798000 5500000 
SIZE 300 300 
SHAPEPATH "/ms_demo/data" 
LAYER 
  NAME "lakes" 
  DATA lakes
  STATUS DEFAULT
  TYPE POLYGON 
  CLASS 
    COLOR 250 175 25 
  END
END
END

Please help me.
Thank you
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