diff --git a/build/icons/vvproj.icns b/build/icons/aisp.icns
similarity index 100%
rename from build/icons/vvproj.icns
rename to build/icons/aisp.icns
diff --git a/build/icons/vvproj.ico b/build/icons/aisp.ico
similarity index 100%
rename from build/icons/vvproj.ico
rename to build/icons/aisp.ico
diff --git a/build/installer_linux.sh b/build/installer_linux.sh
index f4bd22e9..77b4368c 100755
--- a/build/installer_linux.sh
+++ b/build/installer_linux.sh
@@ -429,7 +429,7 @@ cat << EOS > "${MIME_INSTALL_DIR}/packages/aivisspeech.xml"
         <comment>AivisSpeech Project file</comment>
         <comment xml:lang="ja">AivisSpeech プロジェクトファイル</comment>
         <sub-class-of type="application/json" />
-        <glob pattern="*.vvproj" />
+        <glob pattern="*.aisp" />
         <icon name="aivisspeech" />
     </mime-type>
     <mime-type type="application/x-voicevox-plugin-package">
diff --git a/electron-builder.config.js b/electron-builder.config.js
index 99c4d42c..19caa039 100644
--- a/electron-builder.config.js
+++ b/electron-builder.config.js
@@ -62,11 +62,11 @@ const builderOptions = {
   files: ["dist/**/*", "package.json"],
   fileAssociations: [
     {
-      ext: "vvproj",
+      ext: "aisp",
       name: "AivisSpeech Project file",
       description: "AivisSpeech Project file",
       role: "Editor",
-      icon: "icons/vvproj." + (isMac ? "icns" : "ico"),
+      icon: "icons/aisp." + (isMac ? "icns" : "ico"),
     },
     {
       ext: "vvpp",
diff --git a/src/backend/electron/main.ts b/src/backend/electron/main.ts
index eb87e33f..42c47222 100644
--- a/src/backend/electron/main.ts
+++ b/src/backend/electron/main.ts
@@ -395,7 +395,7 @@ async function createWindow() {
   let projectFilePath = "";
   if (isMac) {
     if (filePathOnMac) {
-      if (filePathOnMac.endsWith(".vvproj")) {
+      if (filePathOnMac.endsWith(".aisp")) {
         projectFilePath = encodeURI(filePathOnMac);
       }
       filePathOnMac = undefined;
@@ -406,7 +406,7 @@ async function createWindow() {
       if (
         fs.existsSync(filePath) &&
         fs.statSync(filePath).isFile() &&
-        filePath.endsWith(".vvproj")
+        filePath.endsWith(".aisp")
       ) {
         projectFilePath = encodeURI(filePath);
       }
@@ -759,7 +759,7 @@ ipcMainHandle("SHOW_PROJECT_SAVE_DIALOG", async (_, { title, defaultPath }) => {
     dialog.showSaveDialog(win, {
       title,
       defaultPath,
-      filters: [{ name: "AivisSpeech Project file", extensions: ["vvproj"] }],
+      filters: [{ name: "AivisSpeech Project file", extensions: ["aisp"] }],
       properties: ["showOverwriteConfirmation"],
     })
   );
@@ -772,7 +772,7 @@ ipcMainHandle("SHOW_PROJECT_SAVE_DIALOG", async (_, { title, defaultPath }) => {
 ipcMainHandle("SHOW_PROJECT_LOAD_DIALOG", async (_, { title }) => {
   const result = await dialog.showOpenDialog(win, {
     title,
-    filters: [{ name: "AivisSpeech Project file", extensions: ["vvproj"] }],
+    filters: [{ name: "AivisSpeech Project file", extensions: ["aisp"] }],
     properties: ["openFile", "createDirectory", "treatPackageAsDirectory"],
   });
   if (result.canceled) {
@@ -1213,8 +1213,8 @@ app.on("second-instance", async (event, argv, workDir, rawData) => {
         reloadNeeded: true,
       });
     }
-  } else if (data.filePath.endsWith(".vvproj")) {
-    log.info("Second instance launched with vvproj file");
+  } else if (data.filePath.endsWith(".aisp")) {
+    log.info("Second instance launched with aisp file");
     ipcMainSend(win, "LOAD_PROJECT_FILE", {
       filePath: data.filePath,
       confirm: true,
diff --git a/src/components/Talk/TalkEditor.vue b/src/components/Talk/TalkEditor.vue
index d4ce0464..db3bb0fb 100644
--- a/src/components/Talk/TalkEditor.vue
+++ b/src/components/Talk/TalkEditor.vue
@@ -512,14 +512,14 @@ const loadDraggedFile = (event: { dataTransfer: DataTransfer | null }) => {
     case ".txt":
       store.dispatch("COMMAND_IMPORT_FROM_FILE", { filePath: file.path });
       break;
-    case ".vvproj":
+    case ".aisp":
       store.dispatch("LOAD_PROJECT_FILE", { filePath: file.path });
       break;
     default:
       store.dispatch("SHOW_ALERT_DIALOG", {
         title: "対応していないファイルです",
         message:
-          "テキストファイル (.txt) とAivisSpeechプロジェクトファイル (.vvproj) に対応しています。",
+          "テキストファイル (.txt) とAivisSpeechプロジェクトファイル (.aisp) に対応しています。",
       });
   }
 };
diff --git a/src/store/project.ts b/src/store/project.ts
index 8617d7ea..5c871081 100755
--- a/src/store/project.ts
+++ b/src/store/project.ts
@@ -510,7 +510,7 @@ export const projectStore = createPartialStore<ProjectStoreTypes>({
 
             if (!filePath) {
               // if new project: use generated name
-              defaultPath = `${context.getters.DEFAULT_PROJECT_FILE_BASE_NAME}.vvproj`;
+              defaultPath = `${context.getters.DEFAULT_PROJECT_FILE_BASE_NAME}.aisp`;
             } else {
               // if saveAs for existing project: use current project path
               defaultPath = filePath;