an app which you install from appstore usually creates the folders and files in the app folders.
iOS 7/6 and lower users: /User Applications/AppName using iFunBox or /var/mobile/Applications/AppName using iFile/Filza. iOS 8 users: /User Applications/AppName using iFunBox or /var/mobile/Containers/Data/Application/AppName using iFile/Filza.
if you want to go to the Binary folder of the app on iOS 8 , go to /var/mobile/Containers/Application i think . hope that answers your query. also i can search through all files and folder in iFile? you can try Filza if you find it convinient.
Usually the documents created after you open a newly installed app is at /var/mobile/Containers/ in which there are two folders which usually are modified: Documents and Preferences