diff --git a/doc/file/format.txt b/doc/file/format.txt
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+Heirarchical files
+
+The actual MSE data is stored in heirarchical data files, these are usually files with no extension.
+For example <tt>set</tt> or <tt>locale</tt>.
+These are just ordinary text files, but they use an UTF-8 encoding, that means you need to use an editor that supports UTF-8.
+Most modern editors support UTF-8, Notepad does on Windows XP.
+
+--Syntax--
+The files use a heirarchical structure and are made up of keys and values.
+A value can be either a simple text string:
+>game: magic
+Or a block containing more keys and values:
+>card:
+>	name: My Card
+>	type: Creature
+
+Indentation is used to find out what belongs to what block. Indentation must be exactly one <tt>TAB</tt> per level, spaces are not allowed.
+
+When the value is longer then a single line it can be written indented on the following lines:
+>text:
+>	T: Draw a card
+>	WW: Gain 1 life
+
+--Example--
+For example, a [[type:set]] might look like this:
+>game: magic
+>style: new
+>card:
+>	name: My Card
+>	type: Creature
+>card:
+>	name: Another card
diff --git a/doc/file/index.txt b/doc/file/index.txt
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+Data files
+
+MSE uses several different types of [[file:format|data files]], usually organized into [[file:package]]s.
+
+--File types--
+The following types are stored in [[file:package]]s in the:
+* [[type:game]]
+* [[type:stylesheet]]
+* [[type:symbol font]]
+* [[type:export template]]
+* [[type:locale]]
+
+The following types are stored in [[file:package]]s that can be located anywhere:
+* [[type:set]]
+* [[type:installer]]
+
+The following types are stored diractly in [[file:format|heirarchical files]], they can be located anywhere:
+* [[type:symbol]]
+
+--Data directories--
+The data files that come with Magic Set Editor are stored in [[file:package]]s in the ''data directory'',
+these are usually subdirectories of that directory.
+
+There are two data directories, a ''global'' one with data files installed with the program,
+and a ''local'' data directory for the current logged in user.
+The latter is used for installing packages if the user doesn't have administrator priviliges.
+
+The location of the global data directory is
+! On windows	<<<
+| Location	<tt><i>%MSE_DIR%</i>\data</tt>
+| Usually	<tt>C:\Program Files\Magic Set Editor 2\data</tt>
+! On linux/unix	<<<
+| Location	???
+
+The location of the local data directory is
+! On windows	<<<
+| Location	<tt><i>%USER_APPLICATION_DATA%</i>\Magic Set Editor\data</tt>
+| Usually	<tt>C:\Documents and Settings\<i>%USERNAME%</i>\Application Data\Magic Set Editor\data</tt>
diff --git a/doc/file/package.txt b/doc/file/package.txt
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+Packages
+
+Most files used by Magic Set Editor are stored in ''packages''.
+
+A package is either a zip file or simply a directory.
+
+A package has an extension to indicate its type, for example @"*.mse-set"@ is a [[type:set]] file and @"*.mse-symbol-font"@ is a [[type:symbol font]].
+To open a zipped package using a program like winzip you may need to rename it to @"something.zip"@
+
+--Contents--
+
+A package always contains a [[file:format|heirarchical data file]] with the same name as the package type and no extension.
+For example @"my-set.mse-set"@ contains a file called @"set"@.
+
+A package can also contain other files like images.
+
+--Examples--
+
+The [[file:index|data directory]] contains packages in the form of directories.
+Each of the subdirectories is a package.