From 955af14f6664574df1ff47e073e39f8d48d6355a Mon Sep 17 00:00:00 2001
From: Aldrik Ramaekers <aldrikboy@gmail.com>
Date: Sat, 11 Oct 2025 23:36:54 +0200
Subject: doxygen setup

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 manual/03_files.md | 29 +++++++++++++++++++++++++++++
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+
+# 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.
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