diff --git a/src/olympic/studio/modlib/include/studio/project.hpp b/src/olympic/studio/modlib/include/studio/project.hpp
index 33643e9f..58fcda3e 100644
--- a/src/olympic/studio/modlib/include/studio/project.hpp
+++ b/src/olympic/studio/modlib/include/studio/project.hpp
@@ -31,7 +31,7 @@ enum class ProjectEvent {
 constexpr ox::Result<ox::StringView> fileExt(ox::CRStringView path) noexcept {
 	auto const extStart = ox::find(path.crbegin(), path.crend(), '.').offset();
 	if (!extStart) {
-		return OxError(1, "Cannot open a file without valid extension.");
+		return OxError(1, "file path does not have valid extension");
 	}
 	return substr(path, extStart + 1);
 }
@@ -47,6 +47,7 @@ constexpr ox::StringView parentDir(ox::StringView path) noexcept {
 
 class Project {
 	private:
+		ox::SmallMap<ox::String, ox::Optional<ox::ClawFormat>> m_typeFmt;
 		keel::Context &m_ctx;
 		ox::String m_path;
 		ox::String m_projectDataDir;
@@ -75,7 +76,15 @@ class Project {
 		ox::Error writeObj(
 				ox::CRStringView path,
 				T const&obj,
-				ox::ClawFormat fmt = ox::ClawFormat::Metal) noexcept;
+				ox::ClawFormat fmt) noexcept;
+
+		/**
+		 * Writes a MetalClaw object to the project at the given path.
+		 */
+		template<typename T>
+		ox::Error writeObj(
+				ox::CRStringView path,
+				T const&obj) noexcept;
 
 		template<typename T>
 		ox::Result<T> loadObj(ox::CRStringView path) const noexcept;
@@ -130,7 +139,8 @@ ox::Error Project::writeObj(ox::CRStringView path, T const&obj, ox::ClawFormat f
 		oxReturnError(ox::buildTypeDef(&m_typeStore, &obj));
 	}
 	oxRequire(desc, m_typeStore.get<T>());
-	auto const descExists = m_fs.stat(ox::sfmt("{}/{}", m_typeDescPath, buildTypeId(*desc))).error != 0;
+	auto const descPath = ox::sfmt("{}/{}", m_typeDescPath, buildTypeId(*desc));
+	auto const descExists = m_fs.exists(descPath);
 	if (!descExists) {
 		oxReturnError(writeTypeStore());
 	}
@@ -140,6 +150,13 @@ ox::Error Project::writeObj(ox::CRStringView path, T const&obj, ox::ClawFormat f
 	return {};
 }
 
+template<typename T>
+ox::Error Project::writeObj(ox::CRStringView path, T const&obj) noexcept {
+	oxRequire(ext, fileExt(path));
+	auto const fmt = m_typeFmt[ext].or_value(ox::ClawFormat::Metal);
+	return writeObj(path, obj, fmt);
+}
+
 template<typename T>
 ox::Result<T> Project::loadObj(ox::CRStringView path) const noexcept {
 	oxRequire(buff, loadBuff(path));