If you’ve downloaded and unpacked the ZIP file containing NetBeans sources but find that it seems incomplete, try using another application to unpack the ZIP file. It seems that the popular WinZip application cannot properly handle this file.

The 7-Zip application is free, open source and is known to correctly handle the NetBeans ZIP sources.

Info-ZIP is a free command-line unzip utility for Windows and OS/2 which has been around for more than a decade.

Alternatively, you could write a simple Ant script to use the unzip task for decompressing the archive, or use a ported version of a Unix unzip utility for Windows.