Remmina, Freerdp - how to change keyboard layout on target windows machine

Cannot type underscore sign - question mark is put instead? Most probably keyboard layout is wrong. Check what keyboard layout you have set at the moment.

$ setxkbmap -query
rules:      evdev
model:      pc105
layout:     pl,us

Above we can see two layouts in order: "pl" followed by "us". Lets switch them.

setxkbmap -layout us,pl

Now try to reconnect to the server. Underscore is again underscore ;)