diff --git a/package.json b/package.json
index 97b6b02..2bc2b11 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "real-debrid-downloader",
-  "version": "1.3.6",
+  "version": "1.3.7",
   "description": "Real-Debrid Downloader Desktop (Electron + React + TypeScript)",
   "main": "build/main/main/main.js",
   "author": "Sucukdeluxe",
diff --git a/src/main/extractor.ts b/src/main/extractor.ts
index ada94f0..447ccf9 100644
--- a/src/main/extractor.ts
+++ b/src/main/extractor.ts
@@ -245,11 +245,76 @@ function extractZipArchive(archivePath: string, targetDir: string, conflictMode:
   }
 }
 
+function escapeRegex(value: string): string {
+  return value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+}
+
+export function collectArchiveCleanupTargets(sourceArchivePath: string): string[] {
+  const targets = new Set<string>([sourceArchivePath]);
+  const dir = path.dirname(sourceArchivePath);
+  const fileName = path.basename(sourceArchivePath);
+
+  let filesInDir: string[] = [];
+  try {
+    filesInDir = fs.readdirSync(dir, { withFileTypes: true })
+      .filter((entry) => entry.isFile())
+      .map((entry) => entry.name);
+  } catch {
+    return Array.from(targets);
+  }
+
+  const addMatching = (pattern: RegExp): void => {
+    for (const candidate of filesInDir) {
+      if (pattern.test(candidate)) {
+        targets.add(path.join(dir, candidate));
+      }
+    }
+  };
+
+  const multipartRar = fileName.match(/^(.*)\.part\d+\.rar$/i);
+  if (multipartRar) {
+    const prefix = escapeRegex(multipartRar[1]);
+    addMatching(new RegExp(`^${prefix}\\.part\\d+\\.rar$`, "i"));
+    return Array.from(targets);
+  }
+
+  if (/\.rar$/i.test(fileName)) {
+    const stem = escapeRegex(fileName.replace(/\.rar$/i, ""));
+    addMatching(new RegExp(`^${stem}\\.rar$`, "i"));
+    addMatching(new RegExp(`^${stem}\\.r\\d{2}$`, "i"));
+    return Array.from(targets);
+  }
+
+  if (/\.zip$/i.test(fileName)) {
+    const stem = escapeRegex(fileName.replace(/\.zip$/i, ""));
+    addMatching(new RegExp(`^${stem}\\.zip$`, "i"));
+    addMatching(new RegExp(`^${stem}\\.z\\d{2}$`, "i"));
+    return Array.from(targets);
+  }
+
+  if (/\.7z$/i.test(fileName)) {
+    const stem = escapeRegex(fileName.replace(/\.7z$/i, ""));
+    addMatching(new RegExp(`^${stem}\\.7z$`, "i"));
+    addMatching(new RegExp(`^${stem}\\.7z\\.\\d{3}$`, "i"));
+    return Array.from(targets);
+  }
+
+  return Array.from(targets);
+}
+
 function cleanupArchives(sourceFiles: string[], cleanupMode: CleanupMode): void {
   if (cleanupMode === "none") {
     return;
   }
-  for (const filePath of sourceFiles) {
+
+  const targets = new Set<string>();
+  for (const sourceFile of sourceFiles) {
+    for (const target of collectArchiveCleanupTargets(sourceFile)) {
+      targets.add(target);
+    }
+  }
+
+  for (const filePath of targets) {
     try {
       fs.rmSync(filePath, { force: true });
     } catch {
diff --git a/tests/extractor.test.ts b/tests/extractor.test.ts
index 42f3fd1..1c4f277 100644
--- a/tests/extractor.test.ts
+++ b/tests/extractor.test.ts
@@ -3,7 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import AdmZip from "adm-zip";
 import { afterEach, describe, expect, it } from "vitest";
-import { buildExternalExtractArgs, extractPackageArchives } from "../src/main/extractor";
+import { buildExternalExtractArgs, collectArchiveCleanupTargets, extractPackageArchives } from "../src/main/extractor";
 
 const tempDirs: string[] = [];
 
@@ -71,6 +71,66 @@ describe("extractor", () => {
     expect(fs.existsSync(path.join(targetDir, "release.txt"))).toBe(true);
   });
 
+  it("collects companion rar parts for cleanup", () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-extract-"));
+    tempDirs.push(root);
+    const packageDir = path.join(root, "pkg");
+    fs.mkdirSync(packageDir, { recursive: true });
+
+    const part1 = path.join(packageDir, "show.s01e01.part01.rar");
+    const part2 = path.join(packageDir, "show.s01e01.part02.rar");
+    const part3 = path.join(packageDir, "show.s01e01.part03.rar");
+    const other = path.join(packageDir, "other.s01e01.part01.rar");
+
+    fs.writeFileSync(part1, "a", "utf8");
+    fs.writeFileSync(part2, "b", "utf8");
+    fs.writeFileSync(part3, "c", "utf8");
+    fs.writeFileSync(other, "x", "utf8");
+
+    const targets = new Set(collectArchiveCleanupTargets(part1));
+    expect(targets.has(part1)).toBe(true);
+    expect(targets.has(part2)).toBe(true);
+    expect(targets.has(part3)).toBe(true);
+    expect(targets.has(other)).toBe(false);
+  });
+
+  it("deletes split zip companion parts when cleanup is enabled", async () => {
+    const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-extract-"));
+    tempDirs.push(root);
+    const packageDir = path.join(root, "pkg");
+    const targetDir = path.join(root, "out");
+    fs.mkdirSync(packageDir, { recursive: true });
+
+    const zipPath = path.join(packageDir, "season.zip");
+    const z01Path = path.join(packageDir, "season.z01");
+    const z02Path = path.join(packageDir, "season.z02");
+    const otherPath = path.join(packageDir, "other.z01");
+
+    const zip = new AdmZip();
+    zip.addFile("episode.txt", Buffer.from("ok"));
+    zip.writeZip(zipPath);
+    fs.writeFileSync(z01Path, "part1", "utf8");
+    fs.writeFileSync(z02Path, "part2", "utf8");
+    fs.writeFileSync(otherPath, "keep", "utf8");
+
+    const result = await extractPackageArchives({
+      packageDir,
+      targetDir,
+      cleanupMode: "delete",
+      conflictMode: "overwrite",
+      removeLinks: false,
+      removeSamples: false
+    });
+
+    expect(result.extracted).toBe(1);
+    expect(result.failed).toBe(0);
+    expect(fs.existsSync(zipPath)).toBe(false);
+    expect(fs.existsSync(z01Path)).toBe(false);
+    expect(fs.existsSync(z02Path)).toBe(false);
+    expect(fs.existsSync(otherPath)).toBe(true);
+    expect(fs.existsSync(path.join(targetDir, "episode.txt"))).toBe(true);
+  });
+
   it("treats ask conflict mode as skip in zip extraction", async () => {
     const root = fs.mkdtempSync(path.join(os.tmpdir(), "rd-extract-"));
     tempDirs.push(root);