Finder has this annoying habit of hiding files and extensions it thinks will confuse you. As if!
Show all files
By default Finder hides files that start with "." (dot) and perhaps others too. To see all files, in Terminal type this
defaults write com.apple.finder AppleShowAllFiles true && killall Finder
To revert, change the
false. I originally bumped into this here.
Show all extensions
Finder sometimes likes hiding the file extention like ".html" from you. To fix this: go into Finder's preferences, click the Advanced, and then click "Show all file extensions"