Feature request - Ability to use a key file

```
Because you cannot have more than 5 keys in Pageant (it may vary from 
distribution to distribution but 5 is a pretty common allowed number of failed 
keys) it would be nice if I could specify a key file in PTM directly.
```

Original issue reported on code.google.com by `andrerdn...@googlemail.com` on 18 Jan 2012 at 9:55
