When you have compressed archive searching (e.g. ZIP) active FileLocator Pro treats the files as virtual folders. If the option is switched OFF and the 'Exclude file type...' option switched ON the file type is ignored since you probably don't want to search through the binary data of the ZIP file.
If you DO want to search through the binary data of the compressed file types then just clear the 'Exclude file type...' for all file types.
If you leave the 'File name' field blank then FileLocator Pro will search through all files.