diff --git a/common/web/types/src/main.ts b/common/web/types/src/main.ts
index 3ebb5bd549..b783602fe5 100644
--- a/common/web/types/src/main.ts
+++ b/common/web/types/src/main.ts
@@ -28,3 +28,5 @@ export { TouchLayoutFileWriter, TouchLayoutFileWriterOptions } from './keyman-to
 export * as KPJ from './kpj/kpj-file.js';
 export { KPJFileReader } from './kpj/kpj-file-reader.js';
 export { KeymanDeveloperProject } from './kpj/keyman-developer-project.js';
+
+export * as util from './util/util.js';
\ No newline at end of file
diff --git a/common/web/types/src/util/util.ts b/common/web/types/src/util/util.ts
index 7d70d001d4..9594c6c2f1 100644
--- a/common/web/types/src/util/util.ts
+++ b/common/web/types/src/util/util.ts
@@ -66,3 +66,19 @@ export function unescapeString(s: string): string {
 
   return s;
 }
+
+/**
+ * This function operates similarly to Node's path.basename(); unlike
+ * path.basename(), it currently requires the ext parameter.
+ * @param name a pathname, which should end in ext, e.g. "/tmp/file.xml" or "C:\temp\file.xml"
+ * @param ext  a file extension. including initial period, such as ".xml"
+ * @returns the base name without path or extension
+ */
+export function basename(name: string, ext: string) {
+  const basenameRegexp = new RegExp("([\\/\\\\]|^)([^\\/\\\\]+)\\"+ext+"$", "i");
+  const m = name.match(basenameRegexp);
+  if(!m) {
+    return null;
+  }
+  return m[2];
+}
\ No newline at end of file
diff --git a/common/web/types/test/util/test-util.ts b/common/web/types/test/util/test-util.ts
new file mode 100644
index 0000000000..0bf60a95af
--- /dev/null
+++ b/common/web/types/test/util/test-util.ts
@@ -0,0 +1,17 @@
+import 'mocha';
+import {assert} from 'chai';
+import {basename} from '../../src/util/util.js';
+
+describe('test basename()', function() {
+  it("should correctly extract a base name", function() {
+    assert.equal(basename("file.ext", ".ext"), "file");
+    assert.equal(basename("/tmp/file.ext", ".ext"), "file");
+    assert.equal(basename("..\\myfile.xml", ".xml"), "myfile");
+    assert.equal(basename("C:\\temp.ext\\file.ext", ".ext"), "file");
+  });
+
+  it("should return null if ext cannot be matched", function() {
+    assert.isNull(basename("file.ext", ".xml"));
+    assert.isNull(basename("file.xml.ext", ".xml"));
+  });
+});
diff --git a/developer/src/kmc-keyboard/src/compiler/keymanweb-compiler.ts b/developer/src/kmc-keyboard/src/compiler/keymanweb-compiler.ts
index f9e451d380..7996fc1bc0 100644
--- a/developer/src/kmc-keyboard/src/compiler/keymanweb-compiler.ts
+++ b/developer/src/kmc-keyboard/src/compiler/keymanweb-compiler.ts
@@ -1,4 +1,4 @@
-import { VisualKeyboard, LDMLKeyboard, TouchLayoutFileWriter } from "@keymanapp/common-types";
+import { util, VisualKeyboard, LDMLKeyboard, TouchLayoutFileWriter } from "@keymanapp/common-types";
 import CompilerOptions from "./compiler-options.js";
 import { TouchLayoutCompiler } from "./touch-layout-compiler.js";
 import VisualKeyboardCompiler from "./visual-keyboard-compiler.js";
@@ -43,11 +43,10 @@ export class KeymanWebCompiler {
   }
 
   private cleanName(name: string): string {
-    const m = name.match(/([\/\\]|^)([^\/\\]+)\.xml$/i);
-    if(!m) {
+    let result = util.basename(name, '.xml');
+    if(!result) {
       throw new Error(`Invalid file name ${name}`);
     }
-    let result = m[2];
 
     result = result.replaceAll(/[^a-z0-9]/g, '_');
     if(result.match(/^[0-9]/)) {