It's a different overload. Encoding is not an optional parameter: https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltext https://learn.microso

It's a different overload. Encoding is not an optional parameter: https://learn.microsoft.com/en-us/dotnet/api/system.io.file.writealltext https://learn.microsoft.com/en-us/dotnet/api/system.io.file.... Enforcing an overload of the highest arity of arguments sounds like a really terrible rule to have. Culture-sensitivity is strictly different to locale as it does not act like a C locale (unsound) but simply follows delimiters/dates/currency/etc. format for parsing and formatting. It is also in many places considered to be undesirable as it introduces environment-dependent behavior where it is not expected hence the analyzer will either suggest you to specify invariant culture or alternatively you can specify that in the project through InvariantGlobalization prop (to avoid CultureInfo.InvariantCulture spam). This is still orthogonal to text encoding however.