Bike .bike files are really .html files with a different file extension. Unfortunately QuickLook doesn’t seem to understand this and so doesn’t generate previews. Eventually I need to figure out the problem, or maybe generate my own previews, but that’s low priority at the moment.
In the meantime you can get previews if you:
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Change your .bike file extension to .html. Bike will still be able to read/write the file using that extension, and Finder will generate a preview since it’s a .html file extension.
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The default HTML doesn’t look the best. There is some work in this thread to provide a better CSS preview and instructions for how to use it: Bike format Goals