To be prepared for a possible official unicode version of nsis, the system plugin needs a way to specify ansi strings on both versions.
"a" is already taken, but not as a type, only src/dest, if the parser can handle it, maybe "a" could be overloaded, or if not, maybe "z" or something else.
This way, t can be TCHAR (like it should) and most scripts will work unchanged when converted from ansi to unicode (the unicode system plugin probably also needs to prefer the W version of exports)
http://forums.winamp.com/showthread.php?postid=2322591#post2322591
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"z" sounds good to me. Go for it.
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Patch #2025721 fixed this.