diff --git a/libs/shaderlib.h b/libs/shaderlib.h
index 003f7a8c..4b2259d1 100644
--- a/libs/shaderlib.h
+++ b/libs/shaderlib.h
@@ -41,13 +41,7 @@ inline bool shader_equal_prefix( const char* string, const char* prefix ){
 	return shader_equal_n( string, prefix, string_length( prefix ) );
 }
 
-class shader_less_t
-{
-public:
-	bool operator()( const CopiedString& shader, const CopiedString& other ) const {
-		return shader_less( shader.c_str(), other.c_str() );
-	}
-};
+using shader_less_t = StringLessNoCase;
 
 inline bool shader_valid( const char* shader ){
 	return string_is_ascii( shader )
diff --git a/libs/string/string.h b/libs/string/string.h
index 9f65e3b6..9ceb3f67 100644
--- a/libs/string/string.h
+++ b/libs/string/string.h
@@ -52,6 +52,14 @@ inline int string_compare( const char* string, const char* other ){
 	return std::strcmp( string, other );
 }
 
+/// \brief Returns <0 if [\p string, \p string + \p n) is lexicographically less than [\p other, \p other + \p n).
+/// Returns >0 if [\p string, \p string + \p n) is lexicographically greater than [\p other, \p other + \p n).
+/// Returns 0 if [\p string, \p string + \p n) is lexicographically equal to [\p other, \p other + \p n).
+/// O(n)
+inline int string_compare_n( const char* string, const char* other, std::size_t n ){
+	return std::strncmp( string, other, n );
+}
+
 /// \brief Returns true if \p string is lexicographically equal to \p other.
 /// O(n)
 inline bool string_equal( const char* string, const char* other ){
@@ -61,7 +69,7 @@ inline bool string_equal( const char* string, const char* other ){
 /// \brief Returns true if [\p string, \p string + \p n) is lexicographically equal to [\p other, \p other + \p n).
 /// O(n)
 inline bool string_equal_n( const char* string, const char* other, std::size_t n ){
-	return std::strncmp( string, other, n ) == 0;
+	return string_compare_n( string, other, n ) == 0;
 }
 
 /// \brief Returns true if \p string is lexicographically less than \p other.
@@ -608,6 +616,30 @@ public:
 /// \brief A non-mutable string which uses copy-by-reference for assignment of SmartString.
 typedef String< SmartBuffer< DefaultAllocator<char> > > SmartString;
 
+
+template<>
+struct std::less<CopiedString>
+{
+	using is_transparent = void;
+
+	bool operator()( const CopiedString& x, const CopiedString& y ) const {
+		return string_less( x.c_str(), y.c_str() );
+	}
+	bool operator()( const CopiedString& x, const char *y ) const {
+		return string_less( x.c_str(), y );
+	}
+	bool operator()( const char *x, const CopiedString& y ) const {
+		return string_less( x, y.c_str() );
+	}
+	bool operator()( const CopiedString& string, const StringRange range ) const {
+		return string_compare_n( string.c_str(), range.data(), range.size() ) < 0;
+	}
+	bool operator()( const StringRange range, const CopiedString& string ) const {
+		return string_compare_n( string.c_str(), range.data(), range.size() ) > 0;
+	}
+};
+
+
 class StringEqualNoCase
 {
 public:
@@ -618,9 +650,23 @@ public:
 
 struct StringLessNoCase
 {
+	using is_transparent = void;
+
 	bool operator()( const CopiedString& x, const CopiedString& y ) const {
 		return string_less_nocase( x.c_str(), y.c_str() );
 	}
+	bool operator()( const CopiedString& x, const char *y ) const {
+		return string_less_nocase( x.c_str(), y );
+	}
+	bool operator()( const char *x, const CopiedString& y ) const {
+		return string_less_nocase( x, y.c_str() );
+	}
+	bool operator()( const CopiedString& string, const StringRange range ) const {
+		return string_compare_nocase_n( string.c_str(), range.data(), range.size() ) < 0;
+	}
+	bool operator()( const StringRange range, const CopiedString& string ) const {
+		return string_compare_nocase_n( string.c_str(), range.data(), range.size() ) > 0;
+	}
 };
 
 struct RawStringEqual
diff --git a/radiant/modelwindow.cpp b/radiant/modelwindow.cpp
index 93c0935d..7f2879bb 100644
--- a/radiant/modelwindow.cpp
+++ b/radiant/modelwindow.cpp
@@ -1179,15 +1179,15 @@ public:
 };
 
 
-typedef std::set<CopiedString, bool(*)( const CopiedString&, const CopiedString& )> StringSetWithLambda;
+using StringSetNoCase = std::set<CopiedString, StringLessNoCase>;
 
 class ModelPaths_ArchiveVisitor : public Archive::Visitor
 {
-	const StringSetWithLambda& m_modelExtensions;
+	const StringSetNoCase& m_modelExtensions;
 	ModelFS& m_modelFS;
 public:
 	const ModelFoldersMap& m_modelFoldersMap;
-	ModelPaths_ArchiveVisitor( const StringSetWithLambda& modelExtensions, ModelFS& modelFS, const ModelFoldersMap& modelFoldersMap )
+	ModelPaths_ArchiveVisitor( const StringSetNoCase& modelExtensions, ModelFS& modelFS, const ModelFoldersMap& modelFoldersMap )
 		: m_modelExtensions( modelExtensions ),	m_modelFS( modelFS ), m_modelFoldersMap( modelFoldersMap ){
 	}
 	void visit( const char* name ) override {
@@ -1218,9 +1218,7 @@ void ModelBrowser_constructTree(){
 	class : public IFileTypeList
 	{
 	public:
-		StringSetWithLambda m_modelExtensions{ []( const CopiedString& lhs, const CopiedString& rhs )->bool{
-			return string_less_nocase( lhs.c_str(), rhs.c_str() );
-		} };
+		StringSetNoCase m_modelExtensions;
 		void addType( const char* moduleName, filetype_t type ) override {
 			m_modelExtensions.emplace( moduleName );
 		}