diff -r 884e66fd1b9c gui/ThemeEngine.cpp
--- a/gui/ThemeEngine.cpp	Tue Apr 13 09:30:52 2010 +1000
+++ b/gui/ThemeEngine.cpp	Fri May 28 23:24:43 2010 +1000
@@ -390,21 +390,19 @@
 
 	// Try to create a Common::Archive with the files of the theme.
 	if (!_themeArchive && !_themeFile.empty()) {
-		Common::FSNode node(_themeFile);
-		if (node.getName().hasSuffix(".zip") && !node.isDirectory()) {
+		Common::ArchiveMemberPtr member = SearchMan.getMember(_themeFile);
+		if (member && member->getName().hasSuffix(".zip")) {
 #ifdef USE_ZLIB
-			Common::Archive *zipArchive = Common::makeZipArchive(node);
+			Common::Archive *zipArchive = Common::makeZipArchive(member->createReadStream());
 
 			if (!zipArchive) {
-				warning("Failed to open Zip archive '%s'.", node.getPath().c_str());
+				warning("Failed to open Zip archive '%s'.", member->getDisplayName().c_str());
 			}
 			_themeArchive = zipArchive;
 #else
 			warning("Trying to load theme '%s' in a Zip archive without zLib support", _themeFile.c_str());
 			return false;
 #endif
-		} else if (node.isDirectory()) {
-			_themeArchive = new Common::FSDirectory(node);
 		}
 	}
 
@@ -1436,6 +1434,30 @@
 	return tok.empty();
 }
 
+bool ThemeEngine::themeConfigUsable(const Common::ArchiveMember &member, Common::String &themeName) {
+	Common::File stream;
+	bool foundHeader = false;
+
+	if (member.getName().hasSuffix(".zip")) {
+#ifdef USE_ZLIB
+		Common::Archive *zipArchive = Common::makeZipArchive(member.createReadStream());
+
+		if (zipArchive && zipArchive->hasFile("THEMERC")) {
+			stream.open("THEMERC", *zipArchive);
+		}
+
+		delete zipArchive;
+#endif
+	}
+
+	if (stream.isOpen()) {
+		Common::String stxHeader = stream.readLine();
+		foundHeader = themeConfigParseHeader(stxHeader, themeName);
+	}
+
+	return foundHeader;
+}
+
 bool ThemeEngine::themeConfigUsable(const Common::FSNode &node, Common::String &themeName) {
 	Common::File stream;
 	bool foundHeader = false;
@@ -1493,10 +1515,6 @@
 	if (ConfMan.hasKey("themepath"))
 		listUsableThemes(Common::FSNode(ConfMan.get("themepath")), list);
 
-#ifdef DATA_PATH
-	listUsableThemes(Common::FSNode(DATA_PATH), list);
-#endif
-
 #if defined(MACOSX) || defined(IPHONE)
 	CFURLRef resourceUrl = CFBundleCopyResourcesDirectoryURL(CFBundleGetMainBundle());
 	if (resourceUrl) {
@@ -1509,10 +1527,7 @@
 	}
 #endif
 
-	if (ConfMan.hasKey("extrapath"))
-		listUsableThemes(Common::FSNode(ConfMan.get("extrapath")), list);
-
-	listUsableThemes(Common::FSNode("."), list, 1);
+	listUsableThemes(SearchMan, list);
 
 	// Now we need to strip all duplicates
 	// TODO: It might not be the best idea to strip duplicates. The user might
@@ -1531,6 +1546,34 @@
 	output.clear();
 }
 
+void ThemeEngine::listUsableThemes(Common::Archive &archive, Common::List<ThemeDescriptor> &list) {
+	ThemeDescriptor td;
+
+#ifdef USE_ZLIB
+	Common::ArchiveMemberList fileList;
+	archive.listMatchingMembers(fileList, "*.zip");
+	for (Common::ArchiveMemberList::iterator i = fileList.begin();
+	     i != fileList.end(); ++i) {
+		td.name.clear();
+		if (themeConfigUsable(**i, td.name)) {
+			td.filename = (*i)->getName();
+			td.id = (*i)->getDisplayName();
+
+			// If the name of the node object also contains
+			// the ".zip" suffix, we will strip it.
+			if (td.id.hasSuffix(".zip")) {
+				for (int j = 0; j < 4; ++j)
+					td.id.deleteLastChar();
+			}
+
+			list.push_back(td);
+		}
+	}
+
+	fileList.clear();
+#endif
+}
+
 void ThemeEngine::listUsableThemes(const Common::FSNode &node, Common::List<ThemeDescriptor> &list, int depth) {
 	if (!node.exists() || !node.isReadable() || !node.isDirectory())
 		return;
diff -r 884e66fd1b9c gui/ThemeEngine.h
--- a/gui/ThemeEngine.h	Tue Apr 13 09:30:52 2010 +1000
+++ b/gui/ThemeEngine.h	Fri May 28 23:24:43 2010 +1000
@@ -560,11 +560,13 @@
 	static void listUsableThemes(Common::List<ThemeDescriptor> &list);
 private:
 	static bool themeConfigUsable(const Common::FSNode &node, Common::String &themeName);
+	static bool themeConfigUsable(const Common::ArchiveMember &member, Common::String &themeName);
 	static bool themeConfigParseHeader(Common::String header, Common::String &themeName);
 
 	static Common::String getThemeFile(const Common::String &id);
 	static Common::String getThemeId(const Common::String &filename);
 	static void listUsableThemes(const Common::FSNode &node, Common::List<ThemeDescriptor> &list, int depth = -1);
+	static void listUsableThemes(Common::Archive &archive, Common::List<ThemeDescriptor> &list);
 
 protected:
 	OSystem *_system; /** Global system object. */