[Fix] There is no script engine for file extension .JS – Error

When you attempt to run a .js (JScript Script File) file, one of the following errors may occur:

Can’t find script engine “JScript” for script “filename.js”.

There is no script engine for file extension “.js”.

There is no script engine for file extension

This happens if the .js file association data is missing. Follow these steps to resolve the problem:

Fix .JS file association settings

1. Open an elevated Command Prompt window.

2. Type the following command and press ENTER:

regsvr32 %systemroot%\system32\jscript.dll

3. Type EXIT to close the Command Prompt window.

4. Right-click jscript_fix.reg (zipped), click “Save Target as” or the equivalent option in your browser, and save the REG file to desktop.

5. Unzip the archive, and double-click on the REG file to apply the settings. The REG file applies to all versions of Windows, upto Windows 10.

6. Click Yes when asked for confirmation.

About the author

Ramesh Srinivasan founded Winhelponline.com back in 2005. He is passionate about Microsoft technologies and has a vast experience in the ITeS industry — delivering support for Microsoft's consumer products. He has been a Microsoft MVP [2003 to 2012] who contributes to various Windows support forums.