diff --git a/newIDE/app/src/ResourcesList/ResourceUtils.js b/newIDE/app/src/ResourcesList/ResourceUtils.js
index f98922d7dff7..f3e54a3530e4 100644
--- a/newIDE/app/src/ResourcesList/ResourceUtils.js
+++ b/newIDE/app/src/ResourcesList/ResourceUtils.js
@@ -48,7 +48,12 @@ export const getLocalResourceFullPath = (
       resourcePath.lastIndexOf('?cache=')
     );
   }
-  return resourcePath;
+
+  try {
+    return decodeURIComponent(resourcePath);
+  } catch (error) {
+    return resourcePath;
+  }
 };
 
 export const isPathInProjectFolder = (
diff --git a/newIDE/app/src/ResourcesList/ResourceUtils.spec.js b/newIDE/app/src/ResourcesList/ResourceUtils.spec.js
index 23cbabe8c320..ad62be7844d1 100644
--- a/newIDE/app/src/ResourcesList/ResourceUtils.spec.js
+++ b/newIDE/app/src/ResourcesList/ResourceUtils.spec.js
@@ -1,9 +1,11 @@
 // @flow
 import {
+  getLocalResourceFullPath,
   parseLocalFilePathOrExtensionFromMetadata,
   renameResourcesInProject,
   updateResourceJsonMetadata,
 } from './ResourceUtils';
+import ResourcesLoader from '../ResourcesLoader';
 const gd: libGDevelop = global.gd;
 
 const addNewAnimationWithImageToSpriteObject = (
@@ -22,6 +24,20 @@ const addNewAnimationWithImageToSpriteObject = (
 };
 
 describe('ResourceUtils', () => {
+  it('decodes local resource paths from file URLs', () => {
+    const getResourceFullUrlSpy = jest
+      .spyOn(ResourcesLoader, 'getResourceFullUrl')
+      .mockReturnValue(
+        'file:///Users/me/Game%20Jam%20%231/sprite%20%231.png?cache=123'
+      );
+
+    expect(getLocalResourceFullPath((null: any), 'sprite #1.png')).toBe(
+      '/Users/me/Game Jam #1/sprite #1.png'
+    );
+
+    getResourceFullUrlSpy.mockRestore();
+  });
+
   it('can rename a resource in the whole project', () => {
     const project = gd.ProjectHelper.createNewGDJSProject();
 
diff --git a/newIDE/app/src/ResourcesLoader/index.js b/newIDE/app/src/ResourcesLoader/index.js
index 43f2d79d6d80..611374a0cf7b 100644
--- a/newIDE/app/src/ResourcesLoader/index.js
+++ b/newIDE/app/src/ResourcesLoader/index.js
@@ -4,6 +4,16 @@ import optionalRequire from '../Utils/OptionalRequire';
 const electron = optionalRequire('electron');
 const path = optionalRequire('path');
 
+export const getFileUrlFromPath = (filePath: string): string => {
+  const normalizedFilePath = filePath.replace(/\\/g, '/');
+  return (
+    'file://' +
+    encodeURI(normalizedFilePath)
+      .replace(/#/g, '%23')
+      .replace(/\?/g, '%3F')
+  );
+};
+
 class UrlsCache {
   projectCache: { [number]: { [string]: string } } = {};
 
@@ -132,15 +142,13 @@ export default class ResourcesLoader {
       // Support local filesystem with Electron
       const file = project.getProjectFile();
       const projectPath = path.dirname(file);
-      const resourceAbsolutePath = path
-        .resolve(projectPath, urlOrFilename)
-        .replace(/\\/g, '/');
+      const resourceAbsolutePath = path.resolve(projectPath, urlOrFilename);
 
       console.info('Caching resolved local filename:', resourceAbsolutePath);
       return this._cache.cacheLocalFileUrl(
         project,
         urlOrFilename,
-        'file://' + resourceAbsolutePath,
+        getFileUrlFromPath(resourceAbsolutePath),
         !!disableCacheBurst
       );
     }
diff --git a/newIDE/app/src/ResourcesLoader/index.spec.js b/newIDE/app/src/ResourcesLoader/index.spec.js
new file mode 100644
index 000000000000..d561175ff292
--- /dev/null
+++ b/newIDE/app/src/ResourcesLoader/index.spec.js
@@ -0,0 +1,16 @@
+// @flow
+import { getFileUrlFromPath } from './index';
+
+describe('ResourcesLoader', () => {
+  it('escapes hash characters in local file URLs', () => {
+    expect(getFileUrlFromPath('/Users/me/Game Jam #1/sprite #1.png')).toBe(
+      'file:///Users/me/Game%20Jam%20%231/sprite%20%231.png'
+    );
+  });
+
+  it('escapes question marks before cache-busting parameters are appended', () => {
+    expect(getFileUrlFromPath('/tmp/project/image?draft.png')).toBe(
+      'file:///tmp/project/image%3Fdraft.png'
+    );
+  });
+});