If you download an "all roms" pack but only 50% show up:

ROMs are specific to the emulator version. A ROM that works in MAME might not work in WinKawaks unless it’s part of a set specifically audited for version 1.62.

Unlike modern emulators that might have integrated stores or libraries, Winkawaks requires manual configuration:

Developed by Mr. K, Winkawaks was the first emulator to successfully crack the CROM encryption of the NeoGeo GIGA Power system and emulate The King of Fighters 2000 . It is highly regarded for its low system requirements and "portable" nature, meaning you can run it directly from a USB drive without installation.

A genuine “All Roms” pack for WinKawaks 1.62 should include:

You May Have Missed