On Windows, the API InAppWebViewController.loadFile({required String assetFilePath}) can't work,

[zouzg7829]

Current Behavior

Example Code:
InAppWebView( key: webViewKey, initialSettings: settings, onWebViewCreated: (controller) { webViewController = controller; webViewController?.loadFile( assetFilePath: "assets/player/index.html", ); }, )

Debug the app, the DevTools print the message: Unsafe attempt to load URL file:///E:/Projects/flutter/inappwebview/build/windows/x64/runner/Debug/data/flutter_assets/assets/player/index.html from frame with URL file:///E:/Projects/flutter/inappwebview/build/windows/x64/runner/Debug/data/flutter_assets/assets/player/index.html. 'file:' URLs are treated as unique security origins.

Expected Behavior

the api should be ok on windows just
the [https://pub.dev/documentation/flutter_inappwebview/latest/flutter_inappwebview/InAppWebViewController/loadFile.html] described:
`Officially Supported Platforms/Implementations:

Android native WebView (Official API - WebView.loadUrl)
iOS (Official API - WKWebView.load)
MacOS (Official API - WKWebView.load)
Web
Windows (Official API - ICoreWebView2.Navigate)`

Steps with code example to reproduce

Steps with code example to reproduce

InAppWebView(
              key: webViewKey,
              initialSettings: settings,
              onWebViewCreated: (controller) {
                webViewController = controller;
                webViewController?.loadFile(
                  assetFilePath: "assets/player/index.html",
                );
              },
)

Stacktrace/Logs

Stacktrace/Logs

Debug the app, the DevTools print the message: Unsafe attempt to load URL file:///E:/Projects/flutter/inappwebview/build/windows/x64/runner/Debug/data/flutter_assets/assets/player/index.html from frame with URL file:///E:/Projects/flutter/inappwebview/build/windows/x64/runner/Debug/data/flutter_assets/assets/player/index.html. 'file:' URLs are treated as unique security origins.

Flutter version

Flutter 3.47.0-0.1.pre • channel master • https://github.com/flutter/flutter.git Framework • revision 48a522de6b (10 weeks ago) • 2026-05-12 16:34:34 +0800 Engine • hash a5b7bdf5a090b116d4cf8be405c4b4ed6c3f0b86 (revision 4f6c48822f) (2 months ago) • 2026-05-12 06:14:42.000Z Tools • Dart 3.13.0 (build 3.13.0-103.1.beta) • DevTools 2.58.0

Operating System, Device-specific and/or Tool

Windows10

Plugin version

flutter_inappwebview: ^6.1.5

Additional information

No response