How to open txt file as an exe file in dotPeek?

Hello

I'm trying to help my friend in cleaning his pc from the virus that infected it. I've found a vbs script that is downloading base64 text, converting it into an exe file, and executing it. I've downloaded the text, decoded it, but saved it as a txt file. The problem is dotPeek doesn't want to accept txt files (which is normal reaction, text files aren't supposed to be executables) and I don't want to change the extension to something that would lead Windows to do something more with the file.

Is there a way to tell dotPeek that it should open the file anyway?