This search term can be used to search for files with no extension, for example
- filename
when it should be
- filename.zip
The search term is not perfect, as it brings up other abnormalities such as ._filename.zip or filename.zip<space> or filename.zip 2 – but it does a good job still and these abnormalities are things that should also be check.
ext:[] NOT kind:folder
To use, simply browse to the root level folder that you want to search and enter the search term into the search box.