The template change mean add http argument "line=200" that makes max 200 line out.
That effect can do directory input URL in browser address bar.
http://your-server/modules/eguide/export.php?eid=<event-id>&line=<output-max>
I will check in my local, it works fine.
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安冨　伸浩 (マイサイト管理人)