Hi,
You're right, you can’t have the “/abc” folder and “abc” page in the same CMS folder.
We recommend configuring the folder structure like the following, moving the “abc” page inside the /abc folder and publish it as index.aspx file (default file for .Net, or similar default file for other server-side frameworks)
In this case, your www.this.com/abc/index.aspx page will be available on www.this.com/abc/ URL