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dear all,

whenever i try to a save a notepad file in win Xp it is asking me
in which encoding it should save the file ,it is giving the options
as ANSI,UTF-8, unicode, unicode bigendian etc

now my questions are as follows

1) how different is these encoding options from ASCII encoding ?

2) among ANSI,UTF-8, unicode, unicode bigendian which is the most
portable encoding format ?