How to make FileInsertLine work with a UTF-8 txt file correctly?

[founoflife]

Hi,
My aim is to add some Chinese characters into a UTF-8 txt file.

When I tried to achieve it with FileInsertLine, the added Chinese characters were saved as symbols.
But the same operation worked correctly on the txt files in ANSI and Unicode format.
So I think it is an encoding issue.

I did not find any encoding options for FileInsertLine. Is there a solution for this? Or is this a known issue?

[founoflife]

Somebody help, please.