What works
Some things about Build 11.017 (Not a problem in 11.005).
You can log in by using this workaround:
* Start FirstClass
* Write the name of your working home.fc settings file
* Right click on panel FCC icon and Connect
* Enter your server and login
* DO NOT hit enter after password - click on green button instead - otherwise FirstClass will freeze

What does not

* Settings file not found (Only 11.017)

* Freezes if you hit enter after password (Only 11.017)

If you want to be able to open attachments and web links from FirstClass in you local Linux applications do this (All versions):

1. Download the files winenative
and open_native.reg

2. In a terminal:
# As root
sudo cp winenative /usr/bin/
sudo chmod +x /usr/bin/winenative
# As normal user
regedit open_native.reg

3. All done!

What was not tested
Printing

Additional Comments

Please note the difference between FirstClass 11.005 and 11.017.