That's because it is in core Moodle and automatically is located in the moodle/mod/folder. You will need to get a duplicate copy of your Moodle code and get a copy of the folder from it and place it in your current moodle code.
Resource types
How to Install Folder?
Ši diskusija buvo užrakinta, todėl jūs negalite pateikti atsakymus joje.