# File and data format

Your administration is stored in a single **.openbook** file.  
This is a zip file with the following format:  

    administration.openbook/
    ├── info.xml
    ├── C/
    │   ├── 1.xml
    ├── E/
    │   ├── 2.xml
    ├── I/
    │   ├── 3.xml
    ├── T/
    │   ├── 4.xml
    ├── P/
    │   ├── 5.xml
    ├── documents/
    │   ├── invoice_1.pdf
    │   ├── invoice_2.pdf

**info.xml** : contains all company settings and data. <br /> 
**documents/** : Contains all documents from which invoices have been generated. <br /> 
**C/** : Contacts. <br /> 
**E/** : Cost centers. <br /> 
**I/** : Invoices. <br /> 
**T/** : Tax rates. <br /> 
**P/** : Projects.