diff --git a/common/web/types/src/util/file-types.ts b/common/web/types/src/util/file-types.ts
index eabcb21b523..d00f9daff12 100644
--- a/common/web/types/src/util/file-types.ts
+++ b/common/web/types/src/util/file-types.ts
@@ -166,19 +166,3 @@ export function filenameIs(filename: string, fileType: Source | Binary) {
   }
   return filename.toLowerCase().endsWith(fileType);
 }
-
-/**
- * Replaces a filename extension with the new extension. Returns `null` if the
- * filename does not end with oldExtension.
- * @param filename
- * @param oldExtension
- * @param newExtension
- * @returns
- */
-export function replaceExtension(filename: string, oldExtension: string, newExtension: string): string {
-  const ext = filename.substring(filename.length - oldExtension.length);
-  if(ext !== oldExtension) {
-    return null;
-  }
-  return filename.substring(0, filename.length - oldExtension.length) + newExtension;
-}
\ No newline at end of file
diff --git a/common/web/types/tests/util/file-types.tests.ts b/common/web/types/tests/util/file-types.tests.ts
index 3f4d6870918..f1f841dcccb 100644
--- a/common/web/types/tests/util/file-types.tests.ts
+++ b/common/web/types/tests/util/file-types.tests.ts
@@ -19,7 +19,6 @@ import {
   sourceTypeFromFilename,
   binaryTypeFromFilename,
   filenameIs,
-  replaceExtension,
 } from '../../src/util/file-types.js';
 
 describe('Test of File-Types', () => {
@@ -195,40 +194,4 @@ describe('Test of File-Types', () => {
       assert.isTrue(actual);
     });
   });
-  describe('Test of replaceExtension()', () => {
-    it('can replace an extension', () => {
-      const oldExt      = ".cpp";
-      const newExt      = ".js";
-      const oldFilename = `file${oldExt}`;
-      const newFilename = `file${newExt}`;
-      const actual      = replaceExtension(oldFilename, oldExt, newExt);
-      assert.deepEqual(actual, newFilename);
-    });
-    it('should return null for incorrect old extension (too short)', () => {
-      const oldExt      = ".ts";
-      const newExt      = ".js";
-      const oldFilename = `file.c`;
-      const actual      = replaceExtension(oldFilename, oldExt, newExt);
-      assert.isNull(actual);
-    });
-    it('should return null for incorrect old extension (too long)', () => {
-      const oldExt      = ".ts";
-      const newExt      = ".js";
-      const oldFilename = `file.cpp`;
-      const actual      = replaceExtension(oldFilename, oldExt, newExt);
-      assert.isNull(actual);
-    });
-    // it('should return null for null old extension', () => {
-    //   const newExt      = ".js";
-    //   const oldFilename = `file.ts`;
-    //   const actual      = replaceExtension(oldFilename, null, newExt);
-    //   assert.isNull(actual);
-    // });
-    // it('should return null for null new extension', () => {
-    //   const oldExt      = ".ts";
-    //   const oldFilename = `file.ts`;
-    //   const actual      = replaceExtension(oldFilename, oldExt, null);
-    //   assert.isNull(actual);
-    // });
-  });
 });