Fix file loading dialog fallback

electron/main.ts

@@ -1,4 +1,5 @@
 import { app, BrowserWindow, Menu, dialog, ipcMain } from "electron";
+import type { OpenDialogOptions } from "electron";
 import { readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
@@ -31,11 +32,17 @@ async function createWindow() {
   }
 }
 
-ipcMain.handle("envhelper:open-file", async () => {
-  const result = await dialog.showOpenDialog({
+ipcMain.handle("envhelper:open-file", async (event) => {
+  const owner = BrowserWindow.fromWebContents(event.sender);
+  const options = {
     properties: ["openFile"],
-    filters: [{ name: "Environment files", extensions: ["env", "txt", "*"] }]
-  });
+    filters: [
+      { name: "Environment files", extensions: ["env", "txt"] },
+      { name: "All files", extensions: ["*"] }
+    ]
+  } satisfies OpenDialogOptions;
+
+  const result = owner ? await dialog.showOpenDialog(owner, options) : await dialog.showOpenDialog(options);
 
   if (result.canceled || result.filePaths.length === 0) {
     return null;

src/App.tsx

@@ -441,6 +441,33 @@ function addUnique(values: string[], value: string): string[] {
   return values.some((entry) => normalizeKey(entry) === normalized) ? values : [...values, value];
 }
 
+function openFileWithBrowserPicker(): Promise<{ name: string; content: string } | null> {
+  return new Promise((resolve) => {
+    const input = document.createElement("input");
+    input.type = "file";
+    input.accept = ".env,.txt,text/plain";
+
+    input.addEventListener(
+      "change",
+      async () => {
+        const file = input.files?.[0];
+        if (!file) {
+          resolve(null);
+          return;
+        }
+
+        resolve({
+          name: file.name,
+          content: await file.text()
+        });
+      },
+      { once: true }
+    );
+
+    input.click();
+  });
+}
+
 export default function App() {
   const [input, setInput] = useState("");
   const [loadedPath, setLoadedPath] = useState<string | null>(null);
@@ -480,11 +507,25 @@ export default function App() {
   }, [ignoredAutoDefaults]);
 
   async function openFile() {
-    const file = await window.envHelper?.openFile();
+    try {
+      if (window.envHelper?.openFile) {
+        const file = await window.envHelper.openFile();
         if (file) {
           setInput(file.content);
           setLoadedPath(file.path);
         }
+
+        return;
+      }
+    } catch (error) {
+      console.warn("Native file dialog failed, falling back to browser file input.", error);
+    }
+
+    const file = await openFileWithBrowserPicker();
+    if (file) {
+      setInput(file.content);
+      setLoadedPath(file.name);
+    }
   }
 
   async function saveFile() {