this tool can (un)compress all file types using zlib library.
To install it - just run the exe. it will add to entries to explorer's context menu:
 * Compress using zlib
 * Decompress using zlib

The entries are added to registry in HKEY_CLASSES_ROOT\*\shell as two subkeys (delete the two to uninstall)

structure of copressed file:

struct COMPRESSED
{
	DWORD originalSize;
	byte data[CompressedSizze];
}

Note: original file name is not saved!

After installing, right click on any file and select "* Compress using zlib" from context menu.
A new file will be created with last extension character renamed to '_' - so you can apply changes to 
files in \DllToLib\resources\