GCFScape is an explorer like utility that enables users to browse Half-Life packages and extract their contents. GCFScape supports .bsp, .gcf, .ncf, .pak, .vpk, .wad and .xzp packages and runs independently of Steam. It also offers the possibility to defragment .gfc files... (
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The program works with the following extensions:
xzp,
pak,
wad,
ncf and
gcf