我的ASPX页面是如何变成UTF-8的？我没有要求它

Yesterday, after a minor markup edit to an aspx page, I was checking the file(s) back into TFS 2005 when I got the message that, "The file encoding has changed from ANSI to UTF-8. Checking the file in with this encoding will cause problems with Compares, etc." or words to that effect.Yesterday, after a minor markup edit to an aspx