diff --git a/src/bundle.ts b/src/bundle.ts
index 3f99521..05bacf4 100644
--- a/src/bundle.ts
+++ b/src/bundle.ts
@@ -3,6 +3,7 @@ import {
 	chmod,
 	lstat,
 	mkdir,
+	readdir,
 	readlink,
 	stat,
 	symlink,
@@ -83,6 +84,11 @@ export abstract class Bundle {
 	 */
 	public readonly path: string;
 
+	/**
+	 * Flat bundle.
+	 */
+	public readonly flat: boolean;
+
 	/**
 	 * Projector instance.
 	 */
@@ -102,9 +108,11 @@ export abstract class Bundle {
 	 * Bundle constructor.
 	 *
 	 * @param path Output path for the main executable.
+	 * @param flat Flat bundle.
 	 */
-	constructor(path: string) {
+	constructor(path: string, flat = false) {
 		this.path = path;
+		this.flat = flat;
 	}
 
 	/**
@@ -447,6 +455,17 @@ export abstract class Bundle {
 	 * Check that output path is valid, else throws.
 	 */
 	protected async _checkOutput() {
+		if (this.flat) {
+			const p = dirname(this.path);
+			if (await fsLstatExists(p)) {
+				for (const n of await readdir(p)) {
+					if (!this.isExcludedFile(n)) {
+						throw new Error(`Output path not empty: ${p}`);
+					}
+				}
+			}
+			return;
+		}
 		await Promise.all(
 			[this.path, this.resourcePath('')].map(async p => {
 				if (await fsLstatExists(p)) {
@@ -596,6 +615,22 @@ export abstract class Bundle {
 		return dest;
 	}
 
+	/**
+	 * Get the projector path.
+	 *
+	 * @returns This path or the nested path.
+	 */
+	protected _getProjectorPath() {
+		return this.flat ? this.path : this._getProjectorPathNested();
+	}
+
+	/**
+	 * Get nested projector path.
+	 *
+	 * @returns Output path.
+	 */
+	protected abstract _getProjectorPathNested(): string;
+
 	/**
 	 * Create projector instance for the bundle.
 	 *
diff --git a/src/bundle/otto.spec.ts b/src/bundle/otto.spec.ts
index 21b9a70..6898ef4 100644
--- a/src/bundle/otto.spec.ts
+++ b/src/bundle/otto.spec.ts
@@ -18,8 +18,8 @@ export async function cleanBundlesDir(...path: string[]) {
 export class BundleOttoDummy extends BundleOtto {
 	public readonly projector: ProjectorOttoDummy;
 
-	constructor(path: string) {
-		super(path);
+	constructor(path: string, flat = false) {
+		super(path, flat);
 
 		this.projector = this._createProjector();
 	}
@@ -28,13 +28,17 @@ export class BundleOttoDummy extends BundleOtto {
 		return '.exe';
 	}
 
-	protected _createProjector() {
+	protected _getProjectorPathNested(): string {
 		const {path, extension} = this;
 		const directory = trimExtension(path, extension, true);
 		if (directory === path) {
 			throw new Error(`Output path must end with: ${extension}`);
 		}
-		return new ProjectorOttoDummy(pathJoin(directory, basename(path)));
+		return pathJoin(directory, basename(path));
+	}
+
+	protected _createProjector() {
+		return new ProjectorOttoDummy(this._getProjectorPath());
 	}
 
 	protected async _writeLauncher() {
diff --git a/src/bundle/otto.test.ts b/src/bundle/otto.test.ts
index 2d78445..3c08fe9 100644
--- a/src/bundle/otto.test.ts
+++ b/src/bundle/otto.test.ts
@@ -247,5 +247,17 @@ void describe('bundle/otto', () => {
 			strictEqual((await st('d/a.txt')).isFile(), true);
 			strictEqual((await st('d/b.txt')).isFile(), true);
 		});
+
+		void it('flat', async () => {
+			const dir = await getDir('flat');
+			const dest = pathJoin(dir, 'application.exe');
+
+			const b = new BundleOttoDummy(dest, true);
+			b.projector.skeleton = fixtureFile('dummy.zip');
+			b.projector.configFile = fixtureFile('config.ini.crlf.bin');
+			await b.write(async p => {
+				await p.createResourceFile('resource.txt', 'testing123');
+			});
+		});
 	});
 });
diff --git a/src/bundle/otto.ts b/src/bundle/otto.ts
index 500996d..0670491 100644
--- a/src/bundle/otto.ts
+++ b/src/bundle/otto.ts
@@ -14,16 +14,19 @@ export abstract class BundleOtto extends Bundle {
 	 * ProjectorOtto constructor.
 	 *
 	 * @param path Output path.
+	 * @param flat Flat bundle.
 	 */
-	constructor(path: string) {
-		super(path);
+	constructor(path: string, flat = false) {
+		super(path, flat);
 	}
 
 	/**
 	 * @inheritdoc
 	 */
 	protected async _close(): Promise<void> {
-		await this._writeLauncher();
+		if (!this.flat) {
+			await this._writeLauncher();
+		}
 		await super._close();
 	}
 
diff --git a/src/bundle/otto/mac.test.ts b/src/bundle/otto/mac.test.ts
index da73d0e..eac56c1 100644
--- a/src/bundle/otto/mac.test.ts
+++ b/src/bundle/otto/mac.test.ts
@@ -63,6 +63,21 @@ void describe('bundle/otto/mac', () => {
 						);
 					});
 				});
+
+				void it('flat', async () => {
+					const dir = await getDir('flat');
+					const dest = pathJoin(dir, 'application.app');
+
+					const b = new BundleOttoMac(dest, true);
+					b.projector.skeleton = await getSkeleton();
+					b.projector.configFile = fixtureFile('config.ini.lf.bin');
+					await b.write(async b => {
+						await b.copyResource(
+							'movie.dir',
+							fixtureFile('dir7.dir')
+						);
+					});
+				});
 			});
 		}
 	});
diff --git a/src/bundle/otto/mac.ts b/src/bundle/otto/mac.ts
index 19bc602..8838033 100644
--- a/src/bundle/otto/mac.ts
+++ b/src/bundle/otto/mac.ts
@@ -22,9 +22,10 @@ export class BundleOttoMac extends BundleOtto {
 	 * BundleOttoMac constructor.
 	 *
 	 * @param path Output path for the main application.
+	 * @param flat Flat bundle.
 	 */
-	constructor(path: string) {
-		super(path);
+	constructor(path: string, flat = false) {
+		super(path, flat);
 
 		this.projector = this._createProjector();
 	}
@@ -45,13 +46,19 @@ export class BundleOttoMac extends BundleOtto {
 		return trimExtension(basename(this.path), this.extension, true);
 	}
 
+	/**
+	 *@inheritdoc
+	 */
+	protected _getProjectorPathNested(): string {
+		const projName = `${this._getLauncherName()}${this.extension}`;
+		return pathJoin(this.path, 'Contents', 'Resources', projName);
+	}
+
 	/**
 	 * @inheritdoc
 	 */
 	protected _createProjector() {
-		const projName = `${this._getLauncherName()}${this.extension}`;
-		const projPath = pathJoin(this.path, 'Contents', 'Resources', projName);
-		return new ProjectorOttoMac(projPath);
+		return new ProjectorOttoMac(this._getProjectorPath());
 	}
 
 	/**
diff --git a/src/bundle/otto/windows.test.ts b/src/bundle/otto/windows.test.ts
index 4e97174..4e2eba5 100644
--- a/src/bundle/otto/windows.test.ts
+++ b/src/bundle/otto/windows.test.ts
@@ -65,6 +65,21 @@ void describe('bundle/otto/windows', () => {
 						);
 					});
 				});
+
+				void it('flat', async () => {
+					const dir = await getDir('flat');
+					const dest = pathJoin(dir, 'application.exe');
+
+					const b = new BundleOttoWindows(dest, true);
+					b.projector.skeleton = await getSkeleton();
+					b.projector.configFile = fixtureFile('config.ini.crlf.bin');
+					await b.write(async b => {
+						await b.copyResource(
+							'movie.dir',
+							fixtureFile('dir7.dir')
+						);
+					});
+				});
 			});
 		}
 	});
diff --git a/src/bundle/otto/windows.ts b/src/bundle/otto/windows.ts
index f4c95ba..3a9a048 100644
--- a/src/bundle/otto/windows.ts
+++ b/src/bundle/otto/windows.ts
@@ -19,9 +19,10 @@ export class BundleOttoWindows extends BundleOtto {
 	 * BundleOttoWindows constructor.
 	 *
 	 * @param path Output path for the main application.
+	 * @param flat Flat bundle.
 	 */
-	constructor(path: string) {
-		super(path);
+	constructor(path: string, flat = false) {
+		super(path, flat);
 
 		this.projector = this._createProjector();
 	}
@@ -34,15 +35,22 @@ export class BundleOttoWindows extends BundleOtto {
 	}
 
 	/**
-	 * @inheritdoc
+	 *@inheritdoc
 	 */
-	protected _createProjector() {
+	protected _getProjectorPathNested(): string {
 		const {path, extension} = this;
 		const directory = trimExtension(path, extension, true);
 		if (directory === path) {
 			throw new Error(`Output path must end with: ${extension}`);
 		}
-		return new ProjectorOttoWindows(pathJoin(directory, basename(path)));
+		return pathJoin(directory, basename(path));
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	protected _createProjector() {
+		return new ProjectorOttoWindows(this._getProjectorPath());
 	}
 
 	/**