Error 1720 in custom action

[jbiddle61]

I'm trying to use a VBScript custom action to alter the [INSTALLDIR] property.
I've got the script set to run 'After Initialization (before first dialog)'.
Even when I have the script with just 'MsgBox "Script is running"', I get the following error:

Error 1720. There is a problem with this Windows
Installer package. A script required for this install to
complete count not be run. Contact your support
personnel or package vendor. Custom action
NewCustomAction1 script error -2146827256, Micros...

Help!

[jbiddle61]

The problem was that I created the .vbs file in Visual Studio which uses UTF-8 for the encoding by default.
VBS DOES NOT LIKE THAT!
It worked fine when I changed the encoding to US-ASCII - Codepage 20127 in the Advanced Save Options for the .vbs file.

Would have been nice to have that noted in the documentation on VB Script custom actions!

[chiranjeevi]

Hello,

Thank you for the valuable feedback.

We would be glad to include of the documentation on VB Script custom actions in respective kb articles in future updates.

Thanks
Chiranjeevi