diff --git a/android/gltfio-android/CMakeLists.txt b/android/gltfio-android/CMakeLists.txt
index 82f4da8398..e80cb2c3a4 100644
--- a/android/gltfio-android/CMakeLists.txt
+++ b/android/gltfio-android/CMakeLists.txt
@@ -26,8 +26,6 @@ add_library(gltfio-jni SHARED
         src/main/cpp/MaterialProvider.cpp
         src/main/cpp/ResourceLoader.cpp
         src/main/cpp/Gltfio.cpp
-
-        ../common/CallbackUtils.cpp
         ../common/NioUtils.cpp
 )
 
diff --git a/android/gltfio-android/src/main/cpp/Gltfio.cpp b/android/gltfio-android/src/main/cpp/Gltfio.cpp
index 82185b81bd..65dcb280e8 100644
--- a/android/gltfio-android/src/main/cpp/Gltfio.cpp
+++ b/android/gltfio-android/src/main/cpp/Gltfio.cpp
@@ -16,19 +16,11 @@
 
 #include <jni.h>
 
-#include "common/NioUtils.h"
-
-extern void registerCallbackUtils(JNIEnv*);
-extern void registerNioUtils(JNIEnv*);
-
 jint JNI_OnLoad(JavaVM* vm, void*) {
     JNIEnv* env;
     if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
         return -1;
     }
 
-    registerCallbackUtils(env);
-    registerNioUtils(env);
-
     return JNI_VERSION_1_6;
 }
diff --git a/android/gltfio-android/src/main/cpp/ResourceLoader.cpp b/android/gltfio-android/src/main/cpp/ResourceLoader.cpp
index c4e5f9ba5d..982bfc779b 100644
--- a/android/gltfio-android/src/main/cpp/ResourceLoader.cpp
+++ b/android/gltfio-android/src/main/cpp/ResourceLoader.cpp
@@ -37,7 +37,7 @@ extern "C" JNIEXPORT jlong JNICALL
 Java_com_google_android_filament_gltfio_ResourceLoader_nCreateResourceLoader(JNIEnv*, jclass,
         jlong nativeEngine) {
     Engine* engine = (Engine*) nativeEngine;
-    return (jlong) new ResourceLoader({ engine, utils::Path(), true, true });
+    return (jlong) new ResourceLoader({ engine, {}, true, true });
 }
 
 extern "C" JNIEXPORT void JNICALL
diff --git a/libs/gltfio/include/gltfio/ResourceLoader.h b/libs/gltfio/include/gltfio/ResourceLoader.h
index 1b8beef109..f71ad68b19 100644
--- a/libs/gltfio/include/gltfio/ResourceLoader.h
+++ b/libs/gltfio/include/gltfio/ResourceLoader.h
@@ -21,7 +21,7 @@
 
 #include <backend/BufferDescriptor.h>
 
-#include <utils/Path.h>
+#include <string>
 
 namespace filament {
     class Engine;
@@ -45,7 +45,7 @@ struct ResourceConfiguration {
 
     //! Optional path or URI that points to the base glTF file. This is used solely
     //! to resolve relative paths.
-    utils::Path gltfPath;
+    std::string gltfPath;
 
     //! If true, adjusts skinning weights to sum to 1. Well formed glTF files do not need this,
     //! but it is useful for robustness.
diff --git a/libs/gltfio/src/FFilamentAsset.h b/libs/gltfio/src/FFilamentAsset.h
index 93f1760415..0a1c5800db 100644
--- a/libs/gltfio/src/FFilamentAsset.h
+++ b/libs/gltfio/src/FFilamentAsset.h
@@ -42,7 +42,6 @@
 
 #include <tsl/robin_map.h>
 
-#include <set>
 #include <string>
 #include <vector>
 
diff --git a/libs/gltfio/src/ResourceLoader.cpp b/libs/gltfio/src/ResourceLoader.cpp
index 584fa0a28a..30572540ed 100644
--- a/libs/gltfio/src/ResourceLoader.cpp
+++ b/libs/gltfio/src/ResourceLoader.cpp
@@ -41,6 +41,13 @@
 
 #include <string>
 
+#if defined(__EMSCRIPTEN__) || defined(ANDROID)
+#define USE_FILESYSTEM 0
+#else
+#define USE_FILESYSTEM 1
+#include <utils/Path.h>
+#endif
+
 using namespace filament;
 using namespace filament::math;
 using namespace utils;
@@ -195,7 +202,7 @@ bool ResourceLoader::loadResources(FFilamentAsset* asset, bool async) {
     // looks inside a cache of externally-supplied data blobs, rather than loading from the
     // filesystem.
 
-    #if defined(STBI_NO_STDIO)
+    #if !USE_FILESYSTEM
 
     if (gltf->buffers_count && !gltf->buffers[0].data && !gltf->buffers[0].uri && gltf->bin) {
         if (gltf->bin_size < gltf->buffers[0].size) {
@@ -395,13 +402,13 @@ void ResourceLoader::Impl::decodeSingleTexture() {
         }
 
         // Otherwise load it from the file system if this platform supports it.
-        #if defined(STBI_NO_STDIO)
+        #if !USE_FILESYSTEM
             slog.e << "Unable to load texture: " << uri << io::endl;
             entry->completed = true;
             mNumDecoderTasksFinished++;
             return;
         #else
-            utils::Path fullpath = this->mConfig.gltfPath.getParent() + uri;
+            utils::Path fullpath = utils::Path(this->mConfig.gltfPath).getParent() + uri;
             entry->texels = stbi_load(fullpath.c_str(), &w, &h, &c, 4);
             return;
         #endif
@@ -430,7 +437,6 @@ void ResourceLoader::Impl::uploadPendingTextures() {
 
 void ResourceLoader::Impl::addTextureCacheEntry(const TextureBinding& tb) {
     TextureCacheEntry* entry = nullptr;
-    const Path directory = mConfig.gltfPath.getParent();
 
     // Check if the texture binding uses BufferView data (i.e. it does not have a URI).
     if (tb.data) {
@@ -464,10 +470,10 @@ void ResourceLoader::Impl::addTextureCacheEntry(const TextureBinding& tb) {
                 &entry->height, &entry->numComponents);
         return;
     }
-    #if defined(STBI_NO_STDIO)
+    #if !USE_FILESYSTEM
         slog.e << "Unable to load texture: " << tb.uri << io::endl;
     #else
-        utils::Path fullpath = directory + tb.uri;
+        utils::Path fullpath = utils::Path(mConfig.gltfPath).getParent() + tb.uri;
         stbi_info(fullpath.c_str(), &entry->width, &entry->height, &entry->numComponents);
     #endif
 }
@@ -579,11 +585,11 @@ bool ResourceLoader::Impl::createTextures(bool async) {
         }
 
         // Otherwise load it from the file system if this platform supports it.
-        #if defined(STBI_NO_STDIO)
+        #if !USE_FILESYSTEM
             slog.e << "Unable to load texture: " << uri << io::endl;
             return false;
         #else
-            utils::Path fullpath = this->mConfig.gltfPath.getParent() + uri;
+            utils::Path fullpath = utils::Path(this->mConfig.gltfPath).getParent() + uri;
             utils::JobSystem::Job* decode = utils::jobs::createJob(*js, parent, [=] {
                 int width, height, comp;
                 entry->texels = stbi_load(fullpath.c_str(), &width, &height, &comp, 4);