diff --git a/src/data/export_template.cpp b/src/data/export_template.cpp
index 0d36b88c..d3038d37 100644
--- a/src/data/export_template.cpp
+++ b/src/data/export_template.cpp
@@ -20,6 +20,7 @@ ExportTemplate::ExportTemplate()
 
 String ExportTemplate::typeNameStatic() { return _("export-template"); }
 String ExportTemplate::typeName() const { return _("export-template"); }
+Version ExportTemplate::fileVersion() const { return file_version_export_template; }
 
 void ExportTemplate::validate(Version) {
 	if (!game) {
diff --git a/src/data/export_template.hpp b/src/data/export_template.hpp
index 5c9fd736..9bde4da2 100644
--- a/src/data/export_template.hpp
+++ b/src/data/export_template.hpp
@@ -35,6 +35,7 @@ class ExportTemplate : public Packaged {
 	
 	static String typeNameStatic();
 	virtual String typeName() const;
+	Version fileVersion() const;
 	virtual void validate(Version = app_version);
   private:
 	DECLARE_REFLECTION();
diff --git a/src/data/format/clipboard.cpp b/src/data/format/clipboard.cpp
index 19f7eacc..199a8b85 100644
--- a/src/data/format/clipboard.cpp
+++ b/src/data/format/clipboard.cpp
@@ -23,7 +23,7 @@
 template <typename T>
 String serialize_for_clipboard(Package& package, T& object) {
 	shared_ptr<wxStringOutputStream> stream( new wxStringOutputStream );
-	Writer writer(stream);
+	Writer writer(stream, file_version_clipboard);
 	WITH_DYNAMIC_ARG(clipboard_package, &package);
 		writer.handle(object);
 	return stream->GetString();
diff --git a/src/data/game.cpp b/src/data/game.cpp
index 0cf1d805..1cadd15b 100644
--- a/src/data/game.cpp
+++ b/src/data/game.cpp
@@ -39,6 +39,7 @@ bool Game::isMagic() const {
 
 String Game::typeNameStatic() { return _("game"); }
 String Game::typeName() const { return _("game"); }
+Version Game::fileVersion() const { return file_version_game; }
 
 IMPLEMENT_REFLECTION(Game) {
 	REFLECT_BASE(Packaged);
diff --git a/src/data/game.hpp b/src/data/game.hpp
index 4bcf0350..67315a2a 100644
--- a/src/data/game.hpp
+++ b/src/data/game.hpp
@@ -69,6 +69,7 @@ class Game : public Packaged {
 	
 	static String typeNameStatic();
 	virtual String typeName() const;
+	Version fileVersion() const;
 	
   protected:
 	virtual void validate(Version);
diff --git a/src/data/installer.cpp b/src/data/installer.cpp
index d44b75b8..14b61012 100644
--- a/src/data/installer.cpp
+++ b/src/data/installer.cpp
@@ -35,6 +35,7 @@ DECLARE_POINTER_TYPE(wxZipInputStream);
 // ----------------------------------------------------------------------------- : Installer
 
 String Installer::typeName() const { return _("installer"); }
+Version Installer::fileVersion() const { return file_version_installer; }
 
 IMPLEMENT_REFLECTION(Installer) {
 	REFLECT_BASE(Packaged);
diff --git a/src/data/installer.hpp b/src/data/installer.hpp
index f60cfd3d..09b8a44b 100644
--- a/src/data/installer.hpp
+++ b/src/data/installer.hpp
@@ -45,6 +45,7 @@ class Installer : public Packaged {
 	
   protected:
 	String typeName() const;
+	Version fileVersion() const;
 	DECLARE_REFLECTION();
 };
 
diff --git a/src/data/locale.cpp b/src/data/locale.cpp
index 07e55468..ea49432a 100644
--- a/src/data/locale.cpp
+++ b/src/data/locale.cpp
@@ -28,6 +28,7 @@ DECLARE_TYPEOF(map<String COMMA SubLocaleP>);
 LocaleP the_locale;
 
 String Locale::typeName() const { return _("locale"); }
+Version Locale::fileVersion() const { return file_version_locale; }
 
 LocaleP Locale::byName(const String& name) {
 	return package_manager.open<Locale>(name + _(".mse-locale"));
diff --git a/src/data/locale.hpp b/src/data/locale.hpp
index 4e631d59..fc2a3b98 100644
--- a/src/data/locale.hpp
+++ b/src/data/locale.hpp
@@ -51,6 +51,7 @@ class Locale : public Packaged {
 	
   protected:
 	String typeName() const;
+	Version fileVersion() const;
 	DECLARE_REFLECTION();
 };
 
diff --git a/src/data/set.cpp b/src/data/set.cpp
index 7c8fbecb..d5feac28 100644
--- a/src/data/set.cpp
+++ b/src/data/set.cpp
@@ -119,6 +119,7 @@ String Set::identification() const {
 
 
 String Set::typeName() const { return _("set"); }
+Version Set::fileVersion() const { return file_version_set; }
 
 // fix values for versions < 0.2.7
 void fix_value_207(const ValueP& value) {
diff --git a/src/data/set.hpp b/src/data/set.hpp
index 25799b39..0b29c30f 100644
--- a/src/data/set.hpp
+++ b/src/data/set.hpp
@@ -113,6 +113,7 @@ class Set : public Packaged {
 	void clearOrderCache();
 	
 	virtual String typeName() const;
+	Version fileVersion() const;
 	/// Validate that the set is correctly loaded
 	virtual void validate(Version = app_version);
 	
diff --git a/src/data/settings.cpp b/src/data/settings.cpp
index 181a65e6..b1c9b38b 100644
--- a/src/data/settings.cpp
+++ b/src/data/settings.cpp
@@ -277,6 +277,6 @@ void Settings::read() {
 }
 
 void Settings::write() {
-	Writer writer(new_shared1<wxFileOutputStream>(settingsFile()));
+	Writer writer(new_shared1<wxFileOutputStream>(settingsFile()), app_version);
 	writer.handle(*this);
 }
diff --git a/src/data/stylesheet.cpp b/src/data/stylesheet.cpp
index 8452539f..c05abd2a 100644
--- a/src/data/stylesheet.cpp
+++ b/src/data/stylesheet.cpp
@@ -63,6 +63,7 @@ String StyleSheet::stylesheetName() const {
 
 String StyleSheet::typeNameStatic() { return _("style"); }
 String StyleSheet::typeName() const { return _("style"); }
+Version StyleSheet::fileVersion() const { return file_version_stylesheet; }
 
 void StyleSheet::validate(Version ver) {
 	Packaged::validate(ver);
diff --git a/src/data/stylesheet.hpp b/src/data/stylesheet.hpp
index f66e05e8..48e22ec7 100644
--- a/src/data/stylesheet.hpp
+++ b/src/data/stylesheet.hpp
@@ -64,6 +64,7 @@ class StyleSheet : public Packaged {
 	
 	static String typeNameStatic();
 	virtual String typeName() const;
+	Version fileVersion() const;
 	/// Validate the stylesheet
 	virtual void validate(Version = app_version);
 	
diff --git a/src/data/symbol_font.cpp b/src/data/symbol_font.cpp
index b52a0fd1..44071b25 100644
--- a/src/data/symbol_font.cpp
+++ b/src/data/symbol_font.cpp
@@ -40,6 +40,7 @@ SymbolFont::~SymbolFont() {
 
 String SymbolFont::typeNameStatic() { return _("symbol-font"); }
 String SymbolFont::typeName() const { return _("symbol-font"); }
+Version SymbolFont::fileVersion() const { return file_version_symbol_font; }
 
 SymbolFontP SymbolFont::byName(const String& name) {
 	return package_manager.open<SymbolFont>(
diff --git a/src/data/symbol_font.hpp b/src/data/symbol_font.hpp
index 42875ec7..1c3faf15 100644
--- a/src/data/symbol_font.hpp
+++ b/src/data/symbol_font.hpp
@@ -70,6 +70,7 @@ class SymbolFont : public Packaged {
 	
 	static String typeNameStatic();
 	virtual String typeName() const;
+	Version fileVersion() const;
 	
 	/// Generate a 'insert symbol' menu.
 	/** This class owns the menu!
diff --git a/src/gui/symbol/window.cpp b/src/gui/symbol/window.cpp
index 1ee90155..c85c5e26 100644
--- a/src/gui/symbol/window.cpp
+++ b/src/gui/symbol/window.cpp
@@ -237,7 +237,7 @@ void SymbolWindow::onFileSave(wxCommandEvent& ev) {
 void SymbolWindow::onFileSaveAs(wxCommandEvent& ev) {
 	String name = wxFileSelector(_("Save symbol"),_(""),_(""),_(""),_("Symbol files (*.mse-symbol)|*.mse-symbol"),wxSAVE, this);
 	if (!name.empty()) {
-		Writer writer(new_shared1<wxFileOutputStream>(name));
+		Writer writer(new_shared1<wxFileOutputStream>(name), file_version_symbol);
 		writer.handle(control->getSymbol());
 	}
 }
@@ -247,7 +247,7 @@ void SymbolWindow::onFileStore(wxCommandEvent& ev) {
 		SymbolValueP value = static_pointer_cast<SymbolValue>(performer->value);
 		Package& package = performer->getLocalPackage();
 		FileName new_filename = package.newFileName(value->field().name,_(".mse-symbol")); // a new unique name in the package
-		Writer writer(package.openOut(new_filename));
+		Writer writer(package.openOut(new_filename), file_version_symbol);
 		writer.handle(control->getSymbol());
 		performer->addAction(value_action(value, new_filename));
 	}
diff --git a/src/resource/msw/mse.rc b/src/resource/msw/mse.rc
index e1eb3919..4b66bc2b 100644
--- a/src/resource/msw/mse.rc
+++ b/src/resource/msw/mse.rc
@@ -193,15 +193,15 @@ expected_locale_keys	TEXT	"../common/expected_locale_keys"
 // -------------------------------------------------------- : Version info
 
 1 VERSIONINFO
-FILEVERSION    0,3,6,1
-PRODUCTVERSION 0,3,6,1
+FILEVERSION    0,3,7,0
+PRODUCTVERSION 0,3,7,0
 FILETYPE VFT_APP
 {
   BLOCK "StringFileInfo"
   {
     BLOCK "040904E4"
     {
-      VALUE "FileVersion",			"0.3.6b"
+      VALUE "FileVersion",			"0.3.7"
       VALUE "License",				"GNU General Public License 2 or later; This is free software, and you are welcome to redistribute it under certain conditions; See the help file for details"
       VALUE "FileDescription",		"Magic Set Editor"
       VALUE "InternalName",			"mse2/8"
diff --git a/src/util/io/get_member.hpp b/src/util/io/get_member.hpp
index 478d4135..43b44b22 100644
--- a/src/util/io/get_member.hpp
+++ b/src/util/io/get_member.hpp
@@ -30,7 +30,6 @@ class GetDefaultMember {
 	inline bool isComplex() const { return false; }
 	inline void addAlias(int, const Char*, const Char*) {}
 	inline void handleIgnore(int, const Char*) {}
-	inline void handleAppVersion() {} // no effect
 	
 	/// The result, or script_nil if the member was not found
 	inline ScriptValueP result() { return value; } 
@@ -78,7 +77,6 @@ class GetMember : private GetDefaultMember {
 	inline bool isComplex() const { return false; }
 	inline void addAlias(int, const Char*, const Char*) {}
 	inline void handleIgnore(int, const Char*) {}
-	inline void handleAppVersion() {} // no effect
 	
 	/// The result, or script_nil if the member was not found
 	inline ScriptValueP result() { return gdm.result(); } 
diff --git a/src/util/io/package.cpp b/src/util/io/package.cpp
index 3b7b227b..2bf8f22d 100644
--- a/src/util/io/package.cpp
+++ b/src/util/io/package.cpp
@@ -530,13 +530,13 @@ void Packaged::loadFully() {
 
 void Packaged::save() {
 	WITH_DYNAMIC_ARG(writing_package, this);
-	writeFile(typeName(), *this);
+	writeFile(typeName(), *this, fileVersion());
 	referenceFile(typeName());
 	Package::save();
 }
 void Packaged::saveAs(const String& package, bool remove_unused) {
 	WITH_DYNAMIC_ARG(writing_package, this);
-	writeFile(typeName(), *this);
+	writeFile(typeName(), *this, fileVersion());
 	referenceFile(typeName());
 	Package::saveAs(package, remove_unused);
 }
@@ -574,6 +574,7 @@ void Packaged::requireDependency(Packaged* package) {
 // ----------------------------------------------------------------------------- : IncludePackage
 
 String IncludePackage::typeName() const { return _("include"); }
+Version IncludePackage::fileVersion() const { return file_version_script; }
 
 IMPLEMENT_REFLECTION(IncludePackage) {
 	REFLECT_BASE(Packaged);
diff --git a/src/util/io/package.hpp b/src/util/io/package.hpp
index 55488a9e..70692040 100644
--- a/src/util/io/package.hpp
+++ b/src/util/io/package.hpp
@@ -133,8 +133,8 @@ class Package : public IntrusivePtrVirtualBase {
 	}
 	
 	template <typename T>
-	void writeFile(const String& file, const T& obj) {
-		Writer writer(openOut(file));
+	void writeFile(const String& file, const T& obj, Version file_version) {
+		Writer writer(openOut(file), file_version);
 		writer.handle(obj);
 	}
 	
@@ -229,6 +229,8 @@ class Packaged : public Package {
 	virtual String typeName() const = 0;
 	/// Can be overloaded to do validation after loading
 	virtual void validate(Version file_app_version);
+	/// What file version should be used for writing files?
+	virtual Version fileVersion() const = 0;
 	
 	DECLARE_REFLECTION_VIRTUAL();
 	
@@ -244,6 +246,7 @@ class Packaged : public Package {
 class IncludePackage : public Packaged {
   protected:
 	String typeName() const;
+	Version fileVersion() const;
 	DECLARE_REFLECTION();
 };
 
diff --git a/src/util/io/package_manager.cpp b/src/util/io/package_manager.cpp
index 00ae37e8..66a9c9b8 100644
--- a/src/util/io/package_manager.cpp
+++ b/src/util/io/package_manager.cpp
@@ -310,7 +310,7 @@ void PackageDirectory::loadDatabase() {
 }
 
 void PackageDirectory::saveDatabase() {
-	Writer writer(new_shared1<wxFileOutputStream>(databaseFile()));
+	Writer writer(new_shared1<wxFileOutputStream>(databaseFile()), app_version);
 	writer.handle(*this);
 }
 String PackageDirectory::databaseFile() {
diff --git a/src/util/io/writer.cpp b/src/util/io/writer.cpp
index 58de7188..2e256cb4 100644
--- a/src/util/io/writer.cpp
+++ b/src/util/io/writer.cpp
@@ -15,18 +15,15 @@
 
 // ----------------------------------------------------------------------------- : Writer
 
-Writer::Writer(const OutputStreamP& output)
+Writer::Writer(const OutputStreamP& output, Version file_app_version)
 	: indentation(0), just_opened(false)
 	, output(output), stream(*output)
 {
 	stream.WriteString(BYTE_ORDER_MARK);
-	handleAppVersion();
+	handle(_("mse_version"), file_app_version);
 }
 
 
-void Writer::handleAppVersion() {
-	handle(_("mse_version"), app_version);
-}
 
 void Writer::enterBlock(const Char* name) {
 	// indenting into a sub-block?
diff --git a/src/util/io/writer.hpp b/src/util/io/writer.hpp
index 1fb95855..1dac1b37 100644
--- a/src/util/io/writer.hpp
+++ b/src/util/io/writer.hpp
@@ -26,7 +26,7 @@ typedef shared_ptr<wxOutputStream> OutputStreamP;
 class Writer {
   public:
 	/// Construct a writer that writes to the given output stream
-	Writer(const OutputStreamP& output);
+	Writer(const OutputStreamP& output, Version file_app_version);
 	
 	/// Tell the reflection code we are not reading
 	inline bool reading()   const { return false; }
@@ -35,9 +35,6 @@ class Writer {
 	inline void addAlias(int, const Char*, const Char*) {}
 	inline void handleIgnore(int, const Char*) {}
 	
-	/// Write the application version
-	void handleAppVersion();
-	
 	// --------------------------------------------------- : Handling objects
 	/// Handle an object: write it under the given name
 	template <typename T>
diff --git a/src/util/version.cpp b/src/util/version.cpp
index 780f567b..cb622ff5 100644
--- a/src/util/version.cpp
+++ b/src/util/version.cpp
@@ -50,14 +50,18 @@ template <> void GetDefaultMember::handle(const Version& v) {
 // ----------------------------------------------------------------------------- : Versions
 
 // NOTE: Don't use leading zeroes, they mean octal
-const Version app_version  = 306; // 0.3.6
+const Version app_version  = 307; // 0.3.7
 #ifdef UNICODE
 const Char* version_suffix = _(" (beta)");
 #else
 const Char* version_suffix = _(" (beta, ascii build)");
 #endif
 
-/*  Changes:
+/// Which version of MSE are the files we write out compatible with?
+/*  The saved files will have these version numbers attached.
+ *  They should be updated whenever a change breaks backwards compatability.
+ *
+ *  Changes:
  *     0.2.0 : start of version numbering practice
  *     0.2.2 : _("include file")
  *     0.2.6 : fix in settings loading
@@ -70,4 +74,13 @@ const Char* version_suffix = _(" (beta, ascii build)");
  *     0.3.5 : word lists, symbol font 'as text'
  *     0.3.6 : free rotation, rotation behaviour changed. 
  */
-const Version file_version = 306; // 0.3.6
+const Version file_version_locale          = 307; // 0.3.7
+const Version file_version_set             = 306; // 0.3.6
+const Version file_version_game            = 307; // 0.3.7
+const Version file_version_stylesheet      = 307; // 0.3.7
+const Version file_version_symbol_font     = 306; // 0.3.6
+const Version file_version_export_template = 307; // 0.3.7
+const Version file_version_installer       = 307; // 0.3.7
+const Version file_version_symbol          = 305; // 0.3.5
+const Version file_version_clipboard       = 306; // 0.3.6
+const Version file_version_script          = 307; // 0.3.7
diff --git a/src/util/version.hpp b/src/util/version.hpp
index 8c5dc002..3fc31558 100644
--- a/src/util/version.hpp
+++ b/src/util/version.hpp
@@ -50,10 +50,19 @@ struct Version {
 extern const Version app_version;
 extern const Char* version_suffix;
 
-/// File version, usually the same as program version,
+/// Which version of MSE are the files we write out compatible with?
 /** When no files are changed the file version is not incremented
  */
-extern const Version file_version;
+extern const Version file_version_locale;
+extern const Version file_version_set;
+extern const Version file_version_game;
+extern const Version file_version_stylesheet;
+extern const Version file_version_symbol_font;
+extern const Version file_version_export_template;
+extern const Version file_version_installer;
+extern const Version file_version_symbol;
+extern const Version file_version_clipboard;
+extern const Version file_version_script;
 
 // ----------------------------------------------------------------------------- : EOF
 #endif