dia for w32 from command line

[Phillip Lord <phillip lord newcastle ac uk>]

I'm trying to use dia from the command line -- using dia -e to export
files run from within make and, er, it isn't working. dia returns, but
nothing happens. No export occurs. When run within make I get 

dia -e Image.png Image.dia
make: *** [Image.png] Error 53


Does this still work? Has something changed. 

Thanks

Phil