| Package | Description | 
|---|---|
| org.apache.poi.poifs.filesystem | filesystem package maps OLE 2 Compound document files to a more familiar filesystem interface. | 
| org.apache.poi.poifs.property | property package contains high and low level Property structures for POIFS. | 
| org.apache.poi.poifs.storage | storage package contains low level binary structures for POIFS's implementation of the OLE 2
 Compound Document Format. | 
| Class and Description | 
|---|
| BATBlock.BATBlockAndIndex | 
| HeaderBlock The block containing the archive header | 
| Class and Description | 
|---|
| HeaderBlock The block containing the archive header | 
| Class and Description | 
|---|
| BATBlock A block of block allocation table entries. | 
| BATBlock.BATBlockAndIndex | 
| BlockWritable An interface for persisting block storage of POIFS components. | 
| HeaderBlock The block containing the archive header | 
| HeaderBlockConstants Constants used in reading/writing the Header block | 
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