Just for the record: no, Windower is closed source.
Also, you're very unlikely to have any success getting Windower 4 to work on Wine. There are numerous incompatibilities. The first thing standing in your way is that the launcher won't work on Mono; it depends on WPF, and there are no plans within the Mono community to implement WPF. You may be able to get around this using Microsoft's .Net Framework instead of Mono, but assuming that even works, there are at least a handfull of other problems with Windower 4 which are unlikely to be resolved on our end any time soon.
However, if I still haven't dissuaded you, and you're serious about getting Windower working on Wine, and you know C++ and C#, talk to me on IRC in #windower on ffochat.com.