[Wine] Install the Windows version of Mono to run .NET problem

[easyw]

Hi to all,
I'm trying to run a windows app that needs mono under wine 1.2
I installed mono through winetricks with 
  'winetricks mono210'
but when I try to run the app with
'wine appname'
I obtain 
'wine: Install the Windows version of Mono to run .NET executables'
and if I run 'wine uninstaller' I can see mono on app installed....
I tried also to clean .wine dir deleting it and reiterating the procedure without succeed... also with mono28 same result

thank you