Macintosh text file with invalid line breaks are created

[Andre Pany via Digitalmars-d-learn]

Hi,

following application creates a text file with strange content:

void writeTextFile(string filePath, string text)
{
	import std.stdio: File;
	auto f = File(filePath, "w");
	f.write(text);
	f.close();
}

void main()
{
	import std.ascii: newline;
	
	string s = "a=1"~newline~"b=2";
	writeTextFile("./test.txt", s);
}

Notepad++ detects the file as macintosh UTF8 file.
The file has following content:
a=1CR
CRLF
b=2

Where the first CR comes from? Is this a bug?
dmd v2.071.2 on win10

Kind regards
André