This is a split bank, presumed to have 129 or more parts, one for each instrument.
All samples from EWQL Colossus were ripped into Colossus.sf2. This is by far the largest SF2 library ever made, at over 32GB, around 3 times as large as Enchant! and 6 times as large as Stgiga's HiDef SF2 library.
Sources show that it comes in something called the "ZSF distribution". Information about the "ZSF distribution" is scarce, however it is believed to be 39GB in size and is believed to contain every single freely licensed SF2 file.
Colossus.sf2 and the ZSF distribution are both extant. Thanks to Daniel Sabados for confirmation!
Stgiga believes that colossus.sf2 was just a VST, but it is proven to be real.