FileBot

This is the format expression I use to rename my movies:
Is it possible to add some code to this, so that any files with a ".nfo" file extension are not renamed?

For example:

1.
I recommend keeping things simple if you don't actually benefit from added complexity:
2.
Conceptually, the selection of files is completely unrelated to formatting of destination paths, so custom formats fundamentally cannot select or unselect files.

There are however many ways of only selecting specific files for processing in the first place.

Here's a non-exclusive list of techniques:
viewtopic.php?t=4222


Alternatively, you can also just hit the DELETE key or the button to remove rows manually.

Good point. I may as well use the {plex} binding here.

The Filter -> Send to: Rename method works perfectly!

This is my first time using the Filter tab. I wasn't sure what its purpose was before and now I know!