DDF - Dreadful Drawing Format：微软办公绘图格式解析
HPSF - Horrible Property Set Format：属性集格式解析
HSSF - Horrible Spreadsheet Format：电子表格解析
HWPF - Horrible Word Processor Format:word 表格解析
Excel (SS=HSSF+XSSF)
Word (HWPF+XWPF)
PowerPoint (HSLF+XSLF)
OpenXML4J (OOXML)
OLE2 Filesystem (POIFS)
OLE2 Document Props (HPSF)
Outlook (HSMF)
Visio (HDGF)
TNEF (HMEF)
Publisher (HPBF)
原文：http://www.cnblogs.com/JAYIT/p/4472131.html