diff --git a/packages/engine-compiler/src/core/compiler.ts b/packages/engine-compiler/src/core/compiler.ts
index 11da7d65f..e40eb50f1 100644
--- a/packages/engine-compiler/src/core/compiler.ts
+++ b/packages/engine-compiler/src/core/compiler.ts
@@ -4,7 +4,6 @@ import { editorBrowserslistQuery } from '@cocos/lib-programming/dist/utils';
 import * as ps from 'path';
 import * as fsExtra from 'fs-extra';
 import { IFeatureItem, IModuleItem, ModuleRenderConfig } from './modules';
-import { fixImportMapExtensions } from './import-map-utils';
 
 const VERSION = '3';
 const TEMP_ENGINE_CONFIG: any = { configs: { defaultConfig: { name: '默认配置', cache: { base: { _value: true }, 'gfx-webgl': { _value: true }, 'gfx-webgl2': { _value: false }, 'gfx-webgpu': { _value: false }, animation: { _value: true }, 'skeletal-animation': { _value: true }, '3d': { _value: true }, meshopt: { _value: false }, '2d': { _value: true }, 'sorting-2d': { _value: false }, 'rich-text': { _value: true }, mask: { _value: true }, graphics: { _value: true }, 'ui-skew': { _value: true }, 'affine-transform': { _value: true }, ui: { _value: true }, particle: { _value: true }, physics: { _value: true, _option: 'physics-physx' }, 'physics-ammo': { _value: true, _flags: { LOAD_BULLET_MANUALLY: false } }, 'physics-cannon': { _value: false }, 'physics-physx': { _value: false, _flags: { LOAD_PHYSX_MANUALLY: false } }, 'physics-builtin': { _value: false }, 'physics-2d': { _value: true, _option: 'physics-2d-box2d' }, 'physics-2d-box2d': { _value: true }, 'physics-2d-box2d-wasm': { _value: false, _flags: { LOAD_BOX2D_MANUALLY: false } }, 'physics-2d-builtin': { _value: false }, 'physics-2d-box2d-jsb': { _value: false }, 'intersection-2d': { _value: true }, primitive: { _value: true }, profiler: { _value: true }, 'occlusion-query': { _value: false }, 'geometry-renderer': { _value: false }, 'debug-renderer': { _value: false }, 'particle-2d': { _value: true }, audio: { _value: true }, video: { _value: true }, webview: { _value: true }, tween: { _value: true }, websocket: { _value: true }, 'websocket-server': { _value: false }, terrain: { _value: true }, 'light-probe': { _value: true }, 'tiled-map': { _value: true }, 'vendor-google': { _value: false }, spine: { _value: true, _option: 'spine-3.8' }, 'spine-3.8': { _value: true, _flags: { LOAD_SPINE_MANUALLY: false } }, 'spine-4.2': { _value: false, _flags: { LOAD_SPINE_MANUALLY: false } }, 'dragon-bones': { _value: true }, marionette: { _value: true }, 'procedural-animation': { _value: true }, 'custom-pipeline-post-process': { _value: false }, 'render-pipeline': { _value: true, _option: 'custom-pipeline' }, 'custom-pipeline': { _value: true }, 'legacy-pipeline': { _value: false }, xr: { _value: false } }, flags: { LOAD_BULLET_MANUALLY: false, LOAD_SPINE_MANUALLY: false, LOAD_PHYSX_MANUALLY: false }, includeModules: ['2d', '3d', 'affine-transform', 'animation', 'audio', 'base', 'custom-pipeline', 'dragon-bones', 'gfx-webgl', 'graphics', 'intersection-2d', 'light-probe', 'marionette', 'mask', 'particle', 'particle-2d', 'physics-2d-box2d', 'physics-physx', 'primitive', 'procedural-animation', 'profiler', 'rich-text', 'skeletal-animation', 'spine-3.8', 'terrain', 'tiled-map', 'tween', 'ui', 'ui-skew', 'video', 'websocket', 'webview'], noDeprecatedFeatures: { value: false, version: '' } } }, globalConfigKey: 'defaultConfig', graphics: { pipeline: 'custom-pipeline', 'custom-pipeline-post-process': false } };
@@ -385,15 +384,8 @@ export class EngineCompiler {
             configurableFlags,
         },
         );
-        // 修正 import-map 中无扩展名的模块映射(见 import-map-utils）。
-        // quick-compiler 的 buildImportMap 直接用 cc.config override 字符串生成映射值：override
-        // 无扩展名(如 pal/*)时生成的 q-bundled URL 也无扩展名，与 bundle 里以 .js 注册的模块
-        // 错位，编辑器/预览的静态 import-map 运行期会 fetch 无扩展名 URL 失败。这里补成 .js。
-        const outputDir = this.isWeb ? ps.join(this.outDir, 'web') : ps.join(this.outDir, 'editor');
-        await fixImportMapExtensions(ps.join(outputDir, 'import-map.json'), this.enginePath);
     }
 
-
     async getConfigurableFlagsOfFeatures(features: string[]) {
         const flags: Record<string, unknown> = {};
         const EngineModulesConfig = TEMP_ENGINE_CONFIG;
diff --git a/packages/engine-compiler/src/core/import-map-utils.ts b/packages/engine-compiler/src/core/import-map-utils.ts
deleted file mode 100644
index abc4ffbc5..000000000
--- a/packages/engine-compiler/src/core/import-map-utils.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import * as ps from 'path';
-import * as fsExtra from 'fs-extra';
-
-/**
- * 修正 import-map 中无扩展名的模块映射值。
- *
- * 背景：`@cocos/quick-compiler` 的 `buildImportMap` 直接使用 `cc.config.json` 的 override
- * 字符串生成 import-map 的映射值，只做 `.ts→.js`/`.json→.js` 的扩展名转换。若 override 写成
- * 无扩展名(如 `pal/system-info/nodejs/system-info`)，生成的 `q-bundled:///fs/*` URL 也无
- * 扩展名，而 bundle 里模块是以输出扩展名 `.js` 注册的。编辑器/预览用的是**静态 import-map**
- * (运行期没有解析器补扩展名)，于是会去 fetch 无扩展名 URL 而失败。
- *
- * 这里在 import-map 生成后做一次后处理：把无扩展名的 `q-bundled:///fs/*` 值，按引擎目录下实际
- * 存在的源文件(`.js` 或 `.ts`)补成输出扩展名 `.js`(输出扩展名恒为 `.js`，`.ts` 也会被编译成
- * `.js`)。只加不改——已带扩展名(`.js`/`.mjs`/`.cjs`/`.jsx`/`.json`)、非 `fs` 值(如
- * `q-bundled:///virtual/cc.js`、外部 `cce:/*`)、或没有对应源文件的值都保持原样，因此对 vanilla
- * 引擎(override 本就带 `.ts`，生成值已是 `.js`)零影响。
- *
- * @param importMapFile import-map.json 路径。
- * @param enginePath 引擎根目录，用于校验 `fs/*` 值对应的源文件是否存在。
- * @returns 是否发生了修改(未修改时不重写文件)。
- */
-export async function fixImportMapExtensions(importMapFile: string, enginePath: string): Promise<boolean> {
-    let importMap: { imports?: Record<string, string> };
-    try {
-        importMap = await fsExtra.readJson(importMapFile);
-    } catch {
-        return false;
-    }
-    const imports = importMap && importMap.imports;
-    if (!imports) {
-        return false;
-    }
-    const prefix = 'q-bundled:///fs/';
-    let changed = false;
-    for (const key of Object.keys(imports)) {
-        const value = imports[key];
-        if (typeof value !== 'string' || !value.startsWith(prefix)) {
-            continue;
-        }
-        const rel = value.slice(prefix.length);
-        if (/\.[cm]?jsx?$|\.json$/i.test(rel)) {
-            continue; // 已带扩展名
-        }
-        const relPath = decodeURIComponent(rel);
-        if (fsExtra.existsSync(ps.join(enginePath, `${relPath}.js`))
-            || fsExtra.existsSync(ps.join(enginePath, `${relPath}.ts`))) {
-            imports[key] = `${value}.js`;
-            changed = true;
-        }
-    }
-    if (changed) {
-        await fsExtra.outputJson(importMapFile, importMap, { spaces: 2 });
-    }
-    return changed;
-}
diff --git a/tests/engine-compiler-fix-import-map-extensions.test.ts b/tests/engine-compiler-fix-import-map-extensions.test.ts
deleted file mode 100644
index 788563bb4..000000000
--- a/tests/engine-compiler-fix-import-map-extensions.test.ts
+++ /dev/null
@@ -1,93 +0,0 @@
-import * as os from 'os';
-import * as ps from 'path';
-import * as fsExtra from 'fs-extra';
-import { fixImportMapExtensions } from '../packages/engine-compiler/src/core/import-map-utils';
-
-/**
- * 覆盖 engine-compiler 的 import-map 后处理：
- * pal 等 override 无扩展名时，编辑器/预览编译生成的静态 import-map 会停在无扩展名 URL，
- * 与 bundle 里以 .js 注册的模块错位。fixImportMapExtensions 负责按实际源文件补成 .js。
- */
-describe('engine-compiler / fixImportMapExtensions', () => {
-    let engineRoot: string;
-    let importMapFile: string;
-
-    beforeEach(async () => {
-        engineRoot = await fsExtra.mkdtemp(ps.join(os.tmpdir(), 'engine-compiler-imap-'));
-        importMapFile = ps.join(engineRoot, 'bin', '.cache', 'dev-cli', 'editor', 'import-map.json');
-        // 造 pal 源文件：一个只有 .js（模拟私有包产物），一个只有 .ts（模拟本地源码调试）
-        await fsExtra.outputFile(ps.join(engineRoot, 'pal/system-info/nodejs/system-info.js'), '// js');
-        await fsExtra.outputFile(ps.join(engineRoot, 'pal/system-info/nodejs/system-info.d.ts'), '// dts');
-        await fsExtra.outputFile(ps.join(engineRoot, 'pal/audio/tsonly/player.ts'), '// ts');
-    });
-
-    afterEach(async () => {
-        await fsExtra.remove(engineRoot);
-    });
-
-    async function run(imports: Record<string, string>) {
-        await fsExtra.outputJson(importMapFile, { imports });
-        const changed = await fixImportMapExtensions(importMapFile, engineRoot);
-        const result = (await fsExtra.readJson(importMapFile)).imports as Record<string, string>;
-        return { changed, result };
-    }
-
-    it('无扩展名 + 有 .js 源文件 → 补成 .js', async () => {
-        const { changed, result } = await run({
-            'pal/system-info': 'q-bundled:///fs/pal/system-info/nodejs/system-info',
-        });
-        expect(changed).toBe(true);
-        expect(result['pal/system-info']).toBe('q-bundled:///fs/pal/system-info/nodejs/system-info.js');
-    });
-
-    it('无扩展名 + 只有 .ts 源文件 → 也补成 .js（输出扩展名恒为 .js）', async () => {
-        const { result } = await run({
-            'pal/audio': 'q-bundled:///fs/pal/audio/tsonly/player',
-        });
-        expect(result['pal/audio']).toBe('q-bundled:///fs/pal/audio/tsonly/player.js');
-    });
-
-    it('无扩展名 + 无对应源文件 → 保持不变', async () => {
-        const value = 'q-bundled:///fs/pal/does/not/exist';
-        const { changed, result } = await run({ 'pal/missing': value });
-        expect(changed).toBe(false);
-        expect(result['pal/missing']).toBe(value);
-    });
-
-    it('已带 .js 扩展名 → 不变（vanilla / 私有化写 .js 的情况）', async () => {
-        const value = 'q-bundled:///fs/pal/system-info/nodejs/system-info.js';
-        const { changed, result } = await run({ 'pal/system-info': value });
-        expect(changed).toBe(false);
-        expect(result['pal/system-info']).toBe(value);
-    });
-
-    it('虚拟模块与外部值(非 q-bundled fs) → 不变', async () => {
-        const { changed, result } = await run({
-            cc: 'q-bundled:///virtual/cc.js',
-            'internal:constants': 'cce:/internal/x/constants',
-        });
-        expect(changed).toBe(false);
-        expect(result['cc']).toBe('q-bundled:///virtual/cc.js');
-        expect(result['internal:constants']).toBe('cce:/internal/x/constants');
-    });
-
-    it('混合场景：只改无扩展名且有源文件的项', async () => {
-        const { result } = await run({
-            'pal/system-info': 'q-bundled:///fs/pal/system-info/nodejs/system-info',
-            'pal/system-info-typed': 'q-bundled:///fs/pal/system-info/nodejs/system-info.js',
-            cc: 'q-bundled:///virtual/cc.js',
-            'pal/missing': 'q-bundled:///fs/pal/does/not/exist',
-        });
-        expect(result['pal/system-info']).toBe('q-bundled:///fs/pal/system-info/nodejs/system-info.js');
-        expect(result['pal/system-info-typed']).toBe('q-bundled:///fs/pal/system-info/nodejs/system-info.js');
-        expect(result['cc']).toBe('q-bundled:///virtual/cc.js');
-        expect(result['pal/missing']).toBe('q-bundled:///fs/pal/does/not/exist');
-    });
-
-    it('import-map 不存在 / 无 imports 字段 → 安全返回 false，不抛异常', async () => {
-        await expect(fixImportMapExtensions(ps.join(engineRoot, 'no-such.json'), engineRoot)).resolves.toBe(false);
-        const empty = ps.join(engineRoot, 'empty.json');
-        await fsExtra.outputJson(empty, {});
-        await expect(fixImportMapExtensions(empty, engineRoot)).resolves.toBe(false);
-    });
-});