diff --git a/changelog/unreleased/bugfix-created-file-missing-file-extension b/changelog/unreleased/bugfix-created-file-missing-file-extension
new file mode 100644
index 00000000000..cb008c36af8
--- /dev/null
+++ b/changelog/unreleased/bugfix-created-file-missing-file-extension
@@ -0,0 +1,8 @@
+Bugfix: Created file missing extension when file extensions not shown is active
+
+We've fixed a bug where the file extension was missing,
+when the user set the file extensions not shown configuration option.
+This affected files that are handled via external applications, for example Microsoft Excel.
+
+https://github.com/owncloud/web/issues/10170
+https://github.com/owncloud/web/pull/10169
diff --git a/packages/web-app-files/src/composables/actions/files/useFileActionsCreateNewFile.ts b/packages/web-app-files/src/composables/actions/files/useFileActionsCreateNewFile.ts
index cbaaabc44c7..630e2a67b1f 100644
--- a/packages/web-app-files/src/composables/actions/files/useFileActionsCreateNewFile.ts
+++ b/packages/web-app-files/src/composables/actions/files/useFileActionsCreateNewFile.ts
@@ -195,14 +195,17 @@ export const useFileActionsCreateNewFile = ({
       ),
       inputSelectionRange,
       onCancel: () => store.dispatch('hideModal'),
-      onConfirm: !openAction
-        ? addAppProviderFileFunc
-        : (fileName) => {
-            if (!areFileExtensionsShown.value) {
-              fileName = `${fileName}.${extension}`
-            }
-            addNewFile(fileName, openAction)
-          },
+      onConfirm: (fileName: string) => {
+        if (!areFileExtensionsShown.value) {
+          fileName = `${fileName}.${extension}`
+        }
+
+        if (!openAction) {
+          return addAppProviderFileFunc(fileName)
+        }
+
+        return addNewFile(fileName, openAction)
+      },
       onInput: checkInputValue
     }