Windows (Explorer) does not allow you to create a folder that starts with a dot ('.'). This is for security/exploit reasons. However, it is possible (as you noted) to create the folder manually using the Command Prompt.
Windows (Explorer) does not allow you to create a folder that starts with a dot ('.'). This is for security/exploit reasons. However, it is possible (as you noted) to create the folder manually using the Command Prompt.