Likely - "Klondike" is the technically-correct name for the game popularly known as "Solitaire". Probably it was called Klondike originally but packaged as Solitaire by a PM on the Windows 2.1 team. https://en.wikipedia.org/wiki/Klondike_(solitaire)
But this klond.c is not the original source, judging by the inclusion of comments referencing Win 3.1