There is no script engine for file extension ". js"

Resolution
This happens if the. js file class data is missing or incorrect. Follow these steps to resolve the problem:

Instructions for Windows Vista
Open an Elevated Command Prompt window. To do so, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
* Type the following command and press ENTER:
Regsvr32 % systemroot % \ system32 \ jscript. dll
* Type EXIT to close the Command Prompt window
* Download vista_js_fix.reg from the Attachments section (scroll below), and save it to Desktop
* Right-click vista_js_fix.reg and choose Merge
* Click Yes when asked for confirmation.

Instructions for Windows XP
* Click Start, Run and type:
Regsvr32 % systemroot % \ system32 \ jscript. dll

* Press ENTER
* Download xp_js_fix.reg from the Attachments section below, and save it to Desktop
* Right-click xp_js_fix.reg and choose Merge
* Click Yes when asked for confirmation.

If the above does not solve the problem, then download and install Windows Script 5.7 from the following Microsoft Web site:

Http://www.microsoft.com/downloads/details.aspx? FamilyID = 47809025-D896-482E-A0D6-524E7E844D81 & displaylang = en

Link from: http://www.winhelponline.com/articles/230/1/Error-There-is-no-script-engine-for-file-extension-when-running-js-files.html

Xp_js_fix.reg content

Windows Registry Editor Version 5.00

;. JS file type association fix-Windows XP
; Author: Ramesh srin.pdf
; Created: Aug 30,200 7
; Homepage: http://www.winhelponline.com

[HKEY_CLASSES_ROOT \. JS]
@ = "JSFile"
"CachedFilterIID" = "{c1243ca0-bf96-11cd-b579-08002b30bfeb }"

[HKEY_CLASSES_ROOT \. JS \ PersistentHandler]
@ = "{5e941d80-bf96-11cd-b579-08002b30bfeb }"

[HKEY_CLASSES_ROOT \ JSFile]
@ = "JScript Script File"
"FriendlyTypeName" = hex (2):, 6d ,\
00, 6f, 00, 6f, 25, 00, 5c, 00, 6d, 00 ,\
, 00, 5c, 68, 00, 6c, 6c, 00, 2c ,\
00, 2d, 38, 34, 00

[HKEY_CLASSES_ROOT \ JSFile \ DefaultIcon]
@ = Hex (2): 25, 00, 53,00, 79,00, 00, 6d, 00, 6f, 00, 6f, 25 ,\
00, 5c, 00, 00, 00, 5c, 53, 00 ,\
, 00, 2c, 33, 00, 00

[HKEY_CLASSES_ROOT \ JSFile \ ScriptEngine]
@ = "JScript"

[HKEY_CLASSES_ROOT \ JSFile \ ScriptHostEncode]
@ = "{85131630-480C-11D2-B1F9-00C04F86C324 }"

[HKEY_CLASSES_ROOT \ JSFile \ Shell]

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Edit]
@ = "& Edit"

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Edit \ Command]
@ = "Notepad.exe \" % 1 \""

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Open]
@ = "& Open"

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Open \ Command]
@ = Hex (2): 25, 00, 53,00, 79,00, 00, 6d, 00, 6f, 00, 6f, 25 ,\
00, 5c, 00, 00, 00, 5c, 53, 00 ,\
,\
, 22, 00, 00, 2a, 00

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Open2]
@ = "Open & with Command Prompt"

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Open2 \ Command]
@ = Hex (2): 25, 00, 53,00, 79,00, 00, 6d, 00, 6f, 00, 6f, 25 ,\
00, 5c, 00, 00, 00, 5c, 53, 00 ,\
,\
, 22, 00, 00, 2a, 00

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Print]
@ = "& Print"

[HKEY_CLASSES_ROOT \ JSFile \ Shell \ Print \ Command]
@ = Hex (2): 25, 00, 53,00, 79,00, 00, 6d, 00, 6f, 00, 6f, 25 ,\
00, 5c, 00, 00, 6d, 00, 5c, 00, 4e, 00, 6f, 00 ,\
, 00, 00, 2f, 20 ,\
, 25, 00, 00

[HKEY_CLASSES_ROOT \ JSFile \ ShellEx]

[HKEY_CLASSES_ROOT \ JSFile \ ShellEx \ DropHandler]
@ = "{60254CA5-953B-11CF-8C96-00AA00B8708C }"

[HKEY_CLASSES_ROOT \ JSFile \ ShellEx \ PropertySheetHandlers]

[HKEY_CLASSES_ROOT \ JSFile \ ShellEx \ PropertySheetHandlers \ WSHProps]
@ = "{60254CA5-953B-11CF-8C96-00AA00B8708C }"

[HKEY_CLASSES_ROOT \ JScript]
@ = "JScript Language"

[HKEY_CLASSES_ROOT \ JScript \ CLSID]
@ = "{F414c260-6ac0-11cf-b6d1-00aa00bbbb58 }"

[HKEY_CLASSES_ROOT \ JScript \ OLEScript]