My system:win7+R-3.0.2.
> Sys.getlocale() [1] \"LC_COLLATE=Chinese (Simplified)_People\'s Republic of China.936;LC_CTYPE=Chinese (Simplified)_People\'s R
Try a different argument for read.table: fileEncoding:
fileEncoding
read.table("test.utf8", sep = "," , header=TRUE, fileEncoding = "UTF-8")