diff --git a/src/data/game.cpp b/src/data/game.cpp
index b5e86d28..63c60b21 100644
--- a/src/data/game.cpp
+++ b/src/data/game.cpp
@@ -50,4 +50,13 @@ IMPLEMENT_REFLECTION(Game) {
 void Game::validate() {
 	// a default for the full name
 	if (full_name.empty()) full_name = name();
-}
\ No newline at end of file
+}
+
+// special behaviour of reading/writing GamePs: only read/write the name
+
+void Reader::handle(GameP& game) {
+	game = Game::byName(value);
+}
+void Writer::handle(const GameP& game) {
+	handle(game->name());
+}
diff --git a/src/data/set.cpp b/src/data/set.cpp
index 26baee26..988ab457 100644
--- a/src/data/set.cpp
+++ b/src/data/set.cpp
@@ -7,7 +7,9 @@
 // ----------------------------------------------------------------------------- : Includes
 
 #include <data/set.hpp>
+#include <data/game.hpp>
 #include <data/card.hpp>
+#include <data/field.hpp>
 #include <script/value.hpp>
 
 // ----------------------------------------------------------------------------- : Set
@@ -21,9 +23,15 @@ Set::Set() {}
 String Set::typeName() const { return _("set"); }
 
 IMPLEMENT_REFLECTION(Set) {
+	REFLECT(game);
+	if (data.empty() && game) {
+		data.init(game->set_fields);
+	}
+	REFLECT_N("set_info", data);
 	WITH_DYNAMIC_ARG(game_for_new_cards, game.get()) {
 		REFLECT(cards);
 	}
+	REFLECT(apprentice_code);
 }
 
 
diff --git a/src/data/set.hpp b/src/data/set.hpp
index 58a124e8..e3229fd9 100644
--- a/src/data/set.hpp
+++ b/src/data/set.hpp
@@ -18,6 +18,8 @@ DECLARE_POINTER_TYPE(Card);
 DECLARE_POINTER_TYPE(Set);
 DECLARE_POINTER_TYPE(Game);
 DECLARE_POINTER_TYPE(Stylesheet);
+DECLARE_POINTER_TYPE(Field);
+DECLARE_POINTER_TYPE(Value);
 
 // ----------------------------------------------------------------------------- : Set
 
@@ -33,8 +35,13 @@ class Set : public Packaged {
 	GameP game;
 	/// The default stylesheet
 	StylesheetP stylesheet;
+	/// The values on the fields of the set
+	/** The indices should correspond to the set_fields in the Game */
+	IndexMap<FieldP, ValueP> data;
 	/// The cards in the set
 	vector<CardP> cards;
+	/// Code to use for apprentice (Magic only)
+	String apprentice_code;
 	/// Actions performed on this set and the cards in it
 	ActionStack actions;
 	
diff --git a/src/mse.vcproj b/src/mse.vcproj
index edc42d89..4e316991 100644
--- a/src/mse.vcproj
+++ b/src/mse.vcproj
@@ -819,9 +819,6 @@
 			<File
 				RelativePath=".\util\string.hpp">
 			</File>
-			<File
-				RelativePath=".\util\version.hpp">
-			</File>
 			<File
 				RelativePath=".\util\window_id.hpp">
 			</File>
@@ -934,6 +931,12 @@
 				<File
 					RelativePath=".\util\vector2d.hpp">
 				</File>
+				<File
+					RelativePath=".\util\version.cpp">
+				</File>
+				<File
+					RelativePath=".\util\version.hpp">
+				</File>
 			</Filter>
 		</Filter>
 		<Filter
diff --git a/src/script/value.hpp b/src/script/value.hpp
index 2fe9183e..9c92c1c7 100644
--- a/src/script/value.hpp
+++ b/src/script/value.hpp
@@ -172,6 +172,26 @@ class ScriptCollection : public ScriptValue {
 
 // ----------------------------------------------------------------------------- : Collections : maps
 
+template <typename V>
+ScriptValueP get_member(const map<String,V>& m, const String& name) {
+	map<String,V>::const_iterator it = m.find(name);
+	if (it != m.end()) {
+		return toScript(it->second);
+	} else {
+		throw ScriptError(_("Collection has no member '") + name + _("'"));
+	}
+}
+
+template <typename K, typename V>
+ScriptValueP get_member(const IndexMap<K,V>& m, const String& name) {
+	IndexMap<K,V>::const_iterator it = m.find(name);
+	if (it != m.end()) {
+		return toScript(*it);
+	} else {
+		throw ScriptError(_("Collection has no member '") + name + _("'"));
+	}
+}
+
 /// Script value containing a map-like collection
 template <typename Collection>
 class ScriptMap : public ScriptValue {
@@ -180,12 +200,7 @@ class ScriptMap : public ScriptValue {
 	virtual ScriptType type() const { return SCRIPT_OBJECT; }
 	virtual String typeName() const { return _("collection"); }
 	virtual ScriptValueP getMember(const String& name) const {
-		Collection::const_iterator it = value->find(name);
-		if (it != value->end()) {
-			return toScript(it->second);
-		} else {
-			throw ScriptError(_("Collection has no member ") + name);
-		}
+		return get_member(*value, name);
 	}
   private:
 	/// Store a pointer to a collection, collections are only ever used for structures owned outside the script
diff --git a/src/util/index_map.hpp b/src/util/index_map.hpp
index de56847c..3f387657 100644
--- a/src/util/index_map.hpp
+++ b/src/util/index_map.hpp
@@ -41,7 +41,8 @@ class IndexMap : private vector<Value> {
 	void init(const vector<Key>& keys) {
 		if (!this->empty()) return;
 		this->reserve(keys.size());
-		FOR_EACH_CONST(key, keys) {
+		for(vector<Key>::const_iterator it = keys.begin() ; it != keys.end() ; ++it) {
+			const Key& key = *it;
 			assert(key);
 			if (key->index >= this->size()) this->resize(key->index + 1);
 			init_object(key, (*this)[key->index]);
@@ -68,6 +69,15 @@ class IndexMap : private vector<Value> {
 		return key->index < this.size() && get_key((*this)[key->index]) == key
 	}
 	
+	/// Find a value given the key name, return an iterator
+	template <typename Name>
+	const_iterator find(const Name& key) const {
+		for(vector<Value>::const_iterator it = begin() ; it != end() ; ++it) {
+			if (get_key_name(*it) == key) return it;
+		}
+		return end();
+	}
+	
   private:
 	using vector<Value>::operator [];
 };
diff --git a/src/util/io/get_member.hpp b/src/util/io/get_member.hpp
index e9f76558..3e626966 100644
--- a/src/util/io/get_member.hpp
+++ b/src/util/io/get_member.hpp
@@ -29,6 +29,8 @@ class GetDefaultMember {
 	inline bool reading()   const { return false; }
 	inline bool isComplex() const { return false; }
 	
+	inline void handleAppVersion() {} // no effect
+	
 	/// The result, or script_nil if the member was not found
 	inline ScriptValueP result() { return value; } 
 	
diff --git a/src/util/io/package.cpp b/src/util/io/package.cpp
index bec9fa96..169fd32a 100644
--- a/src/util/io/package.cpp
+++ b/src/util/io/package.cpp
@@ -386,6 +386,7 @@ void Packaged::open(const String& package) {
 	Package::open(package);
 	Reader reader(openIn(typeName()), absoluteFilename() + _("/") + typeName());
 	try {
+		reader.handleAppVersion();
 		reader.handle(*this);
 	} catch (const ParseError& err) {
 		throw FileParseError(err.what(), absoluteFilename() + _("/") + typeName()); // more detailed message
diff --git a/src/util/io/reader.cpp b/src/util/io/reader.cpp
index b8b64d2d..9684ff4e 100644
--- a/src/util/io/reader.cpp
+++ b/src/util/io/reader.cpp
@@ -31,6 +31,21 @@ Reader::Reader(const String& filename)
 }
 
 
+void Reader::handleAppVersion() {
+	if (enterBlock(_("mse_version"))) {
+		handle(app_version);
+		if (::app_version < app_version) {
+			wxMessageBox(
+				filename + _("\n")
+				_("This file is made with a newer version of Magic Set Editor (")+ app_version.toString() +_(").\n")
+				_("When you open it, some aspects of the file may be lost.\n")
+				_("It is recommended that you upgrade to the latest version.\n")
+				_("Visit http:://magicseteditor.sourceforge.net/"), _("Warning"), wxOK | wxICON_EXCLAMATION);
+		}
+		exitBlock();
+	}
+}
+
 void Reader::warning(const String& msg) {
 	wxMessageBox((msg + _("\nOn line: ")) << line_number << _("\nIn file: ") << filename, _("Warning"), wxOK | wxICON_EXCLAMATION);
 }
diff --git a/src/util/io/reader.hpp b/src/util/io/reader.hpp
index 56144e56..327e15c9 100644
--- a/src/util/io/reader.hpp
+++ b/src/util/io/reader.hpp
@@ -10,10 +10,13 @@
 // ----------------------------------------------------------------------------- : Includes
 
 #include <util/prec.hpp>
+#include <util/version.hpp>
 #include <wx/txtstrm.h>
 
 template <typename T> class Defaultable;
 template <typename T> class Scriptable;
+DECLARE_POINTER_TYPE(Game);
+DECLARE_POINTER_TYPE(StyleSheet);
 
 // ----------------------------------------------------------------------------- : Reader
 
@@ -44,6 +47,9 @@ class Reader {
 	/// Is the thing currently being read 'complex', i.e. does it have children
 	inline bool isComplex() const { return value.empty(); }
 	
+	/// Read and check the application version
+	void handleAppVersion();
+	
 	/// Show a warning message, but continue reading
 	void warning(const String& msg);
 	
@@ -72,9 +78,14 @@ class Reader {
 	template <typename T> void handle(Defaultable<T>&);
 	/// Reads a Scriptable from the input stream
 	template <typename T> void handle(Scriptable<T>&);
+	// special behaviour
+	void handle(GameP&);
+	void handle(StyleSheet&);
 	
-  private:
 	// --------------------------------------------------- : Data
+	/// App version this file was made with
+	Version app_version;
+  private:
 	/// The line we read
 	String line;
 	/// The key and value of the last line we read
diff --git a/src/util/io/writer.cpp b/src/util/io/writer.cpp
index 663d7971..9fa80efe 100644
--- a/src/util/io/writer.cpp
+++ b/src/util/io/writer.cpp
@@ -9,6 +9,7 @@
 #include "writer.hpp"
 #include <util/vector2d.hpp>
 #include <util/error.hpp>
+#include <util/version.hpp>
 
 // ----------------------------------------------------------------------------- : Writer
 
@@ -22,6 +23,10 @@ Writer::Writer(const OutputStreamP& output)
 }
 
 
+void Writer::handleAppVersion() {
+	handle(_("mse_version"), app_version);
+}
+
 void Writer::enterBlock(const Char* name) {
 	// indenting into a sub-block?
 	if (just_opened) {
diff --git a/src/util/io/writer.hpp b/src/util/io/writer.hpp
index 19c0cd59..010e7fc9 100644
--- a/src/util/io/writer.hpp
+++ b/src/util/io/writer.hpp
@@ -14,6 +14,8 @@
 
 template <typename T> class Defaultable;
 template <typename T> class Scriptable;
+DECLARE_POINTER_TYPE(Game);
+DECLARE_POINTER_TYPE(StyleSheet);
 
 // ----------------------------------------------------------------------------- : Writer
 
@@ -30,6 +32,9 @@ class Writer {
 	inline bool reading()   const { return false; }
 	inline bool isComplex() const { return false; }
 	
+	/// Write the application version
+	void handleAppVersion();
+	
 	// --------------------------------------------------- : Handling objects
 	/// Handle an object: write it under the given name
 	template <typename T>
@@ -58,6 +63,9 @@ class Writer {
 	template <typename T> void handle(const Defaultable<T>&);
 	/// Write an object of type Scriptable<T> to the output stream
 	template <typename T> void handle(const Scriptable<T>&);
+	// special behaviour
+	void handle(const GameP&);
+	void handle(const StyleSheet&);
 	
   private:
 	// --------------------------------------------------- : Data
diff --git a/src/util/version.hpp b/src/util/version.hpp
index 25395687..6be61244 100644
--- a/src/util/version.hpp
+++ b/src/util/version.hpp
@@ -25,13 +25,15 @@ struct Version {
 	Version()             : version(0)       {}
 	Version(UInt version) : version(version) {}
 	
-	bool operator < (Version v) { return version < v.versionSuffix; }
+	inline bool operator < (Version v) const { return version < v.version; }
 	
 	/// Convert a version number to a string
-	String toString();
+	String toString() const;
+	/// Get the version number as an integer number
+	UInt   toNumber() const;
 	
 	/// Convert a string to a version number
-	static Version fromString(UInt version);
+	static Version fromString(const String& version);
 	
   private:
 	UInt version; ///< Version number encoded as aabbcc, where a=major, b=minor, c=revision
@@ -39,20 +41,14 @@ struct Version {
 
 // ----------------------------------------------------------------------------- : Versions
 
-/// The verwsion number of MSE
-const Version app_version  = 000300; // 0.3.0
-const Char* version_suffix = _(" (beta)");
+/// The version number of MSE
+extern const Version app_version;
+extern const Char* version_suffix;
 
 /// File version, usually the same as program version,
 /** When no files are changed the file version is not incremented
- *  Changes:
- *     0.2.0 : start of version numbering practice
- *     0.2.2 : _("include file")
- *     0.2.6 : fix in settings loading
- *     0.2.7 : new tag system, different style of close tags
- *     0.3.0 : port of code to C++
  */
-const Version file_version = 000300; // 0.3.0
+extern const Version file_version;
 
 // ----------------------------------------------------------------------------- : EOF
 #endif