The main difference between Kontakt formatted files and Kontakt libraries, is due to Kontakt libraries being locked, and requiring an additional activation Serial Number to be used (instructions on this are emailed to you when you place your order). Kontakt formatted files, on the other hand, are unlocked and can be located under the Files tab within the full version of Kontakt. Kontakt libraries can be located under the Libraries tab after you Add Library.
Kontakt Libraries on the other hand use the Native Instruments .nkc format which is a secure locked format, meaning the files have to be loaded into either the free Kontakt Player or the full Kontakt engine to be used.
Only Kontakt Libraries can run within the free Kontakt Player, all Kontakt Files require the fully purchase Kontakt engine.
On our website we have both Kontakt Files and Kontakt Libraries. The Vir2 Instruments World Impact: Global Percussion set is a supported Kontakt library, indicated by the 'Kontakt Library', listed in Formats. Kontakt files such as the Zero-G Surface Tension are indicated as 'Kontakt Files' within the listed Formats.
How to speed up your workflow in Kontakt?
Going back and forth from one tab to the other can slow down your workflow, so this is why Native Instruments have included a handy Quick-Load feature in Kontakt, which you can custom set-up to access all of your Libraries and Files in one quick location. For more information, please see our Quick Load guide linked below.