If you’re searching for a slim offline Markdown viewer for windows there’s hope. There’s already Markdown Pad 2 but it’s bloated. I found the binary executable of the predecessor here: Markdown Pad 1.1. The old version neighter needs the C++ Redistributable nor admin rights. It’s not bloated and starts amazingly fast.
Since not everybody has access to dropbox, here’s another download link to the executable: MDPad.v1.1 (467kb)