diff --git a/api/src/job.ts b/api/src/job.ts
index 88d3e5b4..3f259f49 100644
--- a/api/src/job.ts
+++ b/api/src/job.ts
@@ -542,7 +542,7 @@ const SUPPORTED_EXTENSIONS = new Set([
   '.ics', '.ical', '.ifb', '.icalendar',
   '.conf', '.env', '.gitignore', '.ini', '.properties', '.toml',
   '.doc', '.docx', '.pdf', '.ppt', '.pptx', '.xls', '.xlsx',
-  '.odt', '.ods', '.odp', '.rtf',
+  '.odt', '.ods', '.odp', '.rtf', '.hwp', '.hwpx',
   '.avif', '.bmp', '.gif', '.ico', '.jpeg', '.jpg', '.png',
   '.tif', '.tiff', '.webp',
   '.eot', '.ttf', '.woff', '.woff2',
diff --git a/api/src/walker.test.ts b/api/src/walker.test.ts
index 44e252a6..14151f39 100644
--- a/api/src/walker.test.ts
+++ b/api/src/walker.test.ts
@@ -592,6 +592,21 @@ describe('walkDir / regular file handling', () => {
     expect(names).toEqual(['keep.py']);
   });
 
+  it('keeps Hancom word processor documents', async () => {
+    await fsp.writeFile(path.join(tmpDir, 'report.hwp'), 'hwp');
+    await fsp.writeFile(path.join(tmpDir, 'report.hwpx'), 'hwpx');
+    await fsp.writeFile(path.join(tmpDir, 'UPPER.HWP'), 'hwp');
+
+    const job = makeJob();
+    const internals = asInternals(job);
+    internals.submissionDir = tmpDir;
+
+    await internals.walkDir(tmpDir, 0, new Map());
+
+    const names = internals.generatedFiles.map(f => f.name).sort();
+    expect(names).toEqual(['UPPER.HWP', 'report.hwp', 'report.hwpx']);
+  });
+
   it('keeps supported extensionless output basenames', async () => {
     await fsp.writeFile(path.join(tmpDir, 'Dockerfile'), 'FROM scratch');
     await fsp.mkdir(path.join(tmpDir, 'ci'));