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Generally it's generated by the Net Configuration Assistant, which you can access from Start > Programs > OracleHome > Configuration tools
It's just a text file though, you can generate it by hand using notepad, copy/paste it from a different machine, etc. All that really matters is that you have the format of the entries correct.
You may also want to synchronize sqlnet.ora at the same time (in the same folder) as the two files generally go hand in hand, and some sqlnet.ora entries affect how tnsnames is used.