Did you put it in the correct place?

To find where to put it on windows type %appdata% in the search/run window on the start bar.
Then drill down into the 'roaming' directory
Now look for the directory 'cash' and install it there.

for me the file is named 'cash.conf'  but some people have said they need to name it 'Cash.conf' (capital C for cash) on linux

Hope that helps