Susie

• Website (Japanese): http://www.digitalpad.co.jp/~takechin/
• API Spec (Japanese): http://www2f.biglobe.ne.jp/~kana/spi_api/index.html

Susie is plugin-based image/archive viewer for Windows. Susie plugin API is popular in Japan. There is over 100 (unofficial) Susie plugins and most plugins are for PC Games.