Sometimes we need the script to be encoded (might contains passwords in script or any sensitive information)
and later to if you want to modify the encoded script,we need to have certials tools or methods to decode the script.
If the script is encoded, you can see the extension file with .VBE means Visual Basic encrytion
Are you looking for the tool/software to decrypt the encrypted vb script i.e .vbe files , Until and unless you decode it,you will not able to edit the script .
How to encode VB Script , Script Encoder http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3375
here is an online editor which will decrypt the encrypted code http://www.greymagic.com/security/tools/decoder/ though there are many tools avilable ,it makes me easier in decoding.
Hope It helps!