Why differs German and Swiss Number to String Conversion?

Type (New-Object System.Globalization.CultureInfo("de-CH")).numberFormat to get numberformatinfo for de-CH

You'll get:

CurrencyDecimalDigits    : 2CurrencyDecimalSeparator : .IsReadOnly               : FalseCurrencyGroupSizes       : {3}NumberGroupSizes         : {3}PercentGroupSizes        : {3}CurrencyGroupSeparator   : 'CurrencySymbol           : Fr.NaNSymbol                : n. def.CurrencyNegativePattern  : 2NumberNegativePattern    : 1PercentPositivePattern   : 1PercentNegativePattern   : 1NegativeInfinitySymbol   : -unendlichNegativeSign             : -NumberDecimalDigits      : 2NumberDecimalSeparator   : .NumberGroupSeparator     : 'CurrencyPositivePattern  : 2PositiveInfinitySymbol   : +unendlichPositiveSign             : +PercentDecimalDigits     : 2PercentDecimalSeparator  : .PercentGroupSeparator    : 'PercentSymbol            : %PerMilleSymbol           : ‰NativeDigits             : {0, 1, 2, 3...}DigitSubstitution        : None

As you can see both NumberDecimalSeparator and CurrencyDecimalSeparator are .

No, it looks like Switzerland uses . as the decimal separator (like normal people do), so this is correct output:

http://publib.boulder.ibm.com/infocenter/forms/v3r5m1/index.jsp?topic=%2Fcom.ibm.form.designer.locales.doc%2Fi_xfdl_r_formats_de_CH.html