SymptomsUnable to use period (.) as a decimal sign in Windows virtual machine.
CauseYou have Windows configured to use comma (,) as a decimal sign by default.
ResolutionIn order to change settings, in Windows do the following:
1. Start Parallels Desktop and Windows virtual machine;
2. Click on Start ► Control Panel ► Date, Time, Language and Regional settings;
3. Go to Regional and Language settings ► click on Customize
4. Under Numbers tab, For decimal select "." instead of ","
5. Click on Apply and Ok.