Is it a single file composed of one XML node? Or is it a character-delimited file (i.e. one for BCP) that has a delimited column containing an XML-formatted string? Are there multiple rows each with a section of XML for your XML column?
If it is just a single file, here is some sample text I put in a Notepad++ file encoded with the ISO 8859-2 character set (Eastern European)
xml>??????,???????,????,??????,???,????,????,??????,????????,???????,??????,???????</xml>
Then I used OPENROWSET to import:
DECLARE @x XML
SET @x = (
SELECT * FROM OPENROWSET (BULK 'C:\Download\Russian.txt', SINGLE_NCLOB) AS xmlFile
)
SELECT @x
I was able to see the result in Russian.