Altium Designer, change decimal separator
As far as I know it is not possible. But you can change the "comma" on your numeric keyboard to make a "dot" with the following registry entry:

REGEDIT4

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,34,00,53,00,00,00,00,00


Save this to a file named comma.reg, execute it and when asked, allow Windows to add the changes to the registry.