diff --git a/src/backend/browser/sandbox.ts b/src/backend/browser/sandbox.ts
index de3279fb63..f1ef8025ab 100644
--- a/src/backend/browser/sandbox.ts
+++ b/src/backend/browser/sandbox.ts
@@ -280,4 +280,7 @@ export const api: Sandbox = {
   reloadApp(/* obj: { isMultiEngineOffMode: boolean } */) {
     throw new Error(`Not supported on Browser version: reloadApp`);
   },
+  getPathForFile(/* file: File */) {
+    throw new Error(`Not supported on Browser version: getPathForFile`);
+  },
 };
diff --git a/src/backend/electron/preload.ts b/src/backend/electron/preload.ts
index 878c8f6448..23a3370a4f 100644
--- a/src/backend/electron/preload.ts
+++ b/src/backend/electron/preload.ts
@@ -1,4 +1,4 @@
-import { contextBridge, ipcRenderer } from "electron";
+import { contextBridge, ipcRenderer, webUtils } from "electron";
 import type { IpcRendererInvoke } from "./ipc";
 import {
   ConfigType,
@@ -228,6 +228,11 @@ const api: Sandbox = {
   reloadApp: async ({ isMultiEngineOffMode }) => {
     await ipcRendererInvokeProxy.RELOAD_APP({ isMultiEngineOffMode });
   },
+
+  /** webUtils.getPathForFileを呼ぶ */
+  getPathForFile: (file) => {
+    return webUtils.getPathForFile(file);
+  },
 };
 
 contextBridge.exposeInMainWorld(SandboxKey, api);
diff --git a/src/components/App.vue b/src/components/App.vue
index f49b89c372..51cdbfea1b 100644
--- a/src/components/App.vue
+++ b/src/components/App.vue
@@ -165,6 +165,7 @@ onMounted(async () => {
   // プロジェクトファイルが指定されていればロード
   if (typeof projectFilePath === "string" && projectFilePath !== "") {
     isProjectFileLoaded.value = await store.actions.LOAD_PROJECT_FILE({
+      type: "path",
       filePath: projectFilePath,
     });
   } else {
diff --git a/src/components/Menu/MenuBar/MenuBar.vue b/src/components/Menu/MenuBar/MenuBar.vue
index a94d5d6678..5df82f18d2 100644
--- a/src/components/Menu/MenuBar/MenuBar.vue
+++ b/src/components/Menu/MenuBar/MenuBar.vue
@@ -157,7 +157,7 @@ const saveProjectAs = async () => {
 
 const importProject = () => {
   if (!uiLocked.value) {
-    void store.actions.LOAD_PROJECT_FILE({});
+    void store.actions.LOAD_PROJECT_FILE({ type: "dialog" });
   }
 };
 
@@ -198,6 +198,7 @@ const updateRecentProjects = async () => {
           label: projectFilePath,
           onClick: () => {
             void store.actions.LOAD_PROJECT_FILE({
+              type: "path",
               filePath: projectFilePath,
             });
           },
diff --git a/src/components/Talk/TalkEditor.vue b/src/components/Talk/TalkEditor.vue
index ecf68b6041..dda58caba7 100644
--- a/src/components/Talk/TalkEditor.vue
+++ b/src/components/Talk/TalkEditor.vue
@@ -143,6 +143,7 @@ import {
   actionPostfixSelectNthCharacter,
   HotkeyActionNameType,
 } from "@/domain/hotkeyAction";
+import { isElectron } from "@/helpers/platform";
 
 const props = defineProps<{
   isEnginesReady: boolean;
@@ -574,13 +575,27 @@ const dragEventCounter = ref(0);
 const loadDraggedFile = (event: { dataTransfer: DataTransfer | null }) => {
   if (!event.dataTransfer || event.dataTransfer.files.length === 0) return;
   const file = event.dataTransfer.files[0];
+
+  // electronの場合のみファイルパスを取得できる
+  const filePath = isElectron ? window.backend.getPathForFile(file) : undefined;
+
   switch (path.extname(file.name)) {
     case ".txt":
-      void store.actions.COMMAND_IMPORT_FROM_FILE({ filePath: file.path });
+      if (filePath) {
+        void store.actions.COMMAND_IMPORT_FROM_FILE({ type: "path", filePath });
+      } else {
+        void store.actions.COMMAND_IMPORT_FROM_FILE({ type: "file", file });
+      }
       break;
+
     case ".vvproj":
-      void store.actions.LOAD_PROJECT_FILE({ filePath: file.path });
+      if (filePath) {
+        void store.actions.LOAD_PROJECT_FILE({ type: "path", filePath });
+      } else {
+        void store.actions.LOAD_PROJECT_FILE({ type: "file", file });
+      }
       break;
+
     default:
       void store.actions.SHOW_ALERT_DIALOG({
         title: "対応していないファイルです",
diff --git a/src/components/Talk/ToolBar.vue b/src/components/Talk/ToolBar.vue
index 5bbb6e1e2c..12b1bbbc86 100644
--- a/src/components/Talk/ToolBar.vue
+++ b/src/components/Talk/ToolBar.vue
@@ -145,7 +145,7 @@ const saveProject = async () => {
   await store.actions.SAVE_PROJECT_FILE({ overwrite: true });
 };
 const importTextFile = () => {
-  void store.actions.COMMAND_IMPORT_FROM_FILE({});
+  void store.actions.COMMAND_IMPORT_FROM_FILE({ type: "dialog" });
 };
 
 const usableButtons: Record<
diff --git a/src/components/Talk/menuBarData.ts b/src/components/Talk/menuBarData.ts
index 5a9b73c2ea..cea0fd3a8c 100644
--- a/src/components/Talk/menuBarData.ts
+++ b/src/components/Talk/menuBarData.ts
@@ -46,7 +46,7 @@ export const useMenuBarData = () => {
       type: "button",
       label: "テキスト読み込み",
       onClick: () => {
-        void store.actions.COMMAND_IMPORT_FROM_FILE({});
+        void store.actions.COMMAND_IMPORT_FROM_FILE({ type: "dialog" });
       },
       disableWhenUiLocked: true,
     },
diff --git a/src/plugins/ipcMessageReceiverPlugin.ts b/src/plugins/ipcMessageReceiverPlugin.ts
index 1ae8393ca6..78313ee5f3 100644
--- a/src/plugins/ipcMessageReceiverPlugin.ts
+++ b/src/plugins/ipcMessageReceiverPlugin.ts
@@ -9,8 +9,11 @@ export const ipcMessageReceiver: Plugin = {
     options: { store: Store<State, AllGetters, AllActions, AllMutations> },
   ) => {
     window.backend.onReceivedIPCMsg({
-      LOAD_PROJECT_FILE: (_, { filePath } = {}) =>
-        void options.store.actions.LOAD_PROJECT_FILE({ filePath }),
+      LOAD_PROJECT_FILE: (_, { filePath }) =>
+        void options.store.actions.LOAD_PROJECT_FILE({
+          type: "path",
+          filePath,
+        }),
 
       DETECT_MAXIMIZED: () => options.store.actions.DETECT_MAXIMIZED(),
 
diff --git a/src/store/audio.ts b/src/store/audio.ts
index d433b55ef6..371b0616f7 100644
--- a/src/store/audio.ts
+++ b/src/store/audio.ts
@@ -2886,24 +2886,36 @@ export const audioCommandStore = transformCommandStore(
           prevAudioKey: undefined,
         });
       },
+      /**
+       * セリフテキストファイルを読み込む。
+       * ファイル選択ダイアログを表示するか、ファイルパス指定するか、Fileインスタンスを渡すか選べる。
+       */
       action: createUILockAction(
-        async (
-          { state, mutations, actions, getters },
-          { filePath }: { filePath?: string },
-        ) => {
-          if (!filePath) {
+        async ({ state, mutations, actions, getters }, payload) => {
+          let filePath: undefined | string;
+          if (payload.type == "dialog") {
             filePath = await window.backend.showImportFileDialog({
               title: "セリフ読み込み",
             });
             if (!filePath) return;
+          } else if (payload.type == "path") {
+            filePath = payload.filePath;
           }
-          let body = new TextDecoder("utf-8").decode(
-            await window.backend.readFile({ filePath }).then(getValueOrThrow),
-          );
+
+          let buf: ArrayBuffer;
+          if (filePath != undefined) {
+            buf = await window.backend
+              .readFile({ filePath })
+              .then(getValueOrThrow);
+          } else {
+            if (payload.type != "file")
+              throw new UnreachableError("payload.type != 'file'");
+            buf = await payload.file.arrayBuffer();
+          }
+
+          let body = new TextDecoder("utf-8").decode(buf);
           if (body.includes("\ufffd")) {
-            body = new TextDecoder("shift-jis").decode(
-              await window.backend.readFile({ filePath }).then(getValueOrThrow),
-            );
+            body = new TextDecoder("shift-jis").decode(buf);
           }
           const audioItems: AudioItem[] = [];
           let baseAudioItem: AudioItem | undefined = undefined;
diff --git a/src/store/project.ts b/src/store/project.ts
index 48da368714..3e5a0862d4 100755
--- a/src/store/project.ts
+++ b/src/store/project.ts
@@ -21,7 +21,7 @@ import {
   DEFAULT_TPQN,
 } from "@/sing/domain";
 import { EditorType } from "@/type/preload";
-import { IsEqual } from "@/type/utility";
+import { IsEqual, UnreachableError } from "@/type/utility";
 import {
   showAlertDialog,
   showMessageDialog,
@@ -166,15 +166,13 @@ export const projectStore = createPartialStore<ProjectStoreTypes>({
   LOAD_PROJECT_FILE: {
     /**
      * プロジェクトファイルを読み込む。読み込めたかの成否が返る。
+     * ファイル選択ダイアログを表示するか、ファイルパス指定するか、Fileインスタンスを渡すか選べる。
      * エラー発生時はダイアログが表示される。
      */
     action: createUILockAction(
-      async (
-        { actions, mutations, getters },
-        { filePath }: { filePath?: string },
-      ) => {
-        if (!filePath) {
-          // Select and load a project File.
+      async ({ actions, mutations, getters }, payload) => {
+        let filePath: undefined | string;
+        if (payload.type == "dialog") {
           const ret = await window.backend.showProjectLoadDialog({
             title: "プロジェクトファイルの選択",
           });
@@ -182,17 +180,25 @@ export const projectStore = createPartialStore<ProjectStoreTypes>({
             return false;
           }
           filePath = ret[0];
+        } else if (payload.type == "path") {
+          filePath = payload.filePath;
         }
 
-        let buf: ArrayBuffer;
         try {
-          buf = await window.backend
-            .readFile({ filePath })
-            .then(getValueOrThrow);
+          let buf: ArrayBuffer;
+          if (filePath != undefined) {
+            buf = await window.backend
+              .readFile({ filePath })
+              .then(getValueOrThrow);
 
-          await actions.APPEND_RECENTLY_USED_PROJECT({
-            filePath,
-          });
+            await actions.APPEND_RECENTLY_USED_PROJECT({
+              filePath,
+            });
+          } else {
+            if (payload.type != "file")
+              throw new UnreachableError("payload.type != 'file'");
+            buf = await payload.file.arrayBuffer();
+          }
 
           const text = new TextDecoder("utf-8").decode(buf).trim();
           const parsedProjectData = await actions.PARSE_PROJECT_FILE({
diff --git a/src/store/type.ts b/src/store/type.ts
index 1e83ab6a0b..a57e243881 100644
--- a/src/store/type.ts
+++ b/src/store/type.ts
@@ -690,7 +690,12 @@ export type AudioCommandStoreTypes = {
     mutation: {
       audioKeyItemPairs: { audioItem: AudioItem; audioKey: AudioKey }[];
     };
-    action(payload: { filePath?: string }): void;
+    action(
+      payload:
+        | { type: "dialog" }
+        | { type: "path"; filePath: string }
+        | { type: "file"; file: File },
+    ): void;
   };
 
   COMMAND_PUT_TEXTS: {
@@ -1837,7 +1842,12 @@ export type ProjectStoreTypes = {
   };
 
   LOAD_PROJECT_FILE: {
-    action(payload: { filePath?: string }): boolean;
+    action(
+      payload:
+        | { type: "dialog" }
+        | { type: "path"; filePath: string }
+        | { type: "file"; file: File },
+    ): boolean;
   };
 
   SAVE_PROJECT_FILE: {
diff --git a/src/type/ipc.ts b/src/type/ipc.ts
index 3414f186fd..8c35a089f5 100644
--- a/src/type/ipc.ts
+++ b/src/type/ipc.ts
@@ -241,7 +241,7 @@ export type IpcIHData = {
  */
 export type IpcSOData = {
   LOAD_PROJECT_FILE: {
-    args: [obj: { filePath?: string }];
+    args: [obj: { filePath: string }];
     return: void;
   };
 
diff --git a/src/type/preload.ts b/src/type/preload.ts
index f916bc7b29..a144d2c64d 100644
--- a/src/type/preload.ts
+++ b/src/type/preload.ts
@@ -141,6 +141,7 @@ export interface Sandbox {
   uninstallVvppEngine(engineId: EngineId): Promise<boolean>;
   validateEngineDir(engineDir: string): Promise<EngineDirValidationResult>;
   reloadApp(obj: { isMultiEngineOffMode?: boolean }): Promise<void>;
+  getPathForFile(file: File): string;
 }
 
 export type AppInfos = {