War3map.wts

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Open it with notepad and you'll figure out how it works. Each trigger string is defined by a number (trigger ID) and a value for this number. When Warcraft meets a "TRIGSTR_***" (where "***" is supposed to be a number), it will look in the trigger string table to find the corresponding string and replace the trigger string by that value. The value for a specific trigger ID is set only once by the first definition encountered for this ID: if you have two times the trigger string 0 defined, only the first one will count. The number following "STRING " must be positive: any negative number will be ignored. If text follows "STRING ", it'll be considered as number 0.

String definition: It always start with "STRING " followed by the trigger string ID number which is supposed to be different for each trigger string. Then "{" indicates the begining of the string value followed by a string which can contain several lines and "}" that indicates the end of the trigger string definition.

Example: in the .WTS file you have:

STRING 0 { Blah blah blah... }

Then either in the .J, or in the .W3I, Warcraft finds a TRIGSTR_000, it'll look in the table for trigger string number 0 and it'll find that the value to use is "Blah blah blah" instead of "TRIGSTR_000".