We have two SP2010 installations, one single server with MSSQL2008R2 on the same machine, and another with MSSQL on a different machine. On both installations, we are able to create web apps and site collections, deploy them forth and back. However, on both installations, I only see a BIN subdirectory in \Common Files\microsoft shared\Web Server Extensions\14
As far as my research shows, there should be all the good stuff I need for developement, especially the ISAPI folder and much more.
Any idea what is wrong? Do I miss an SP 2010 installation step, do I have to activate something?
 Thanks a lot for the answers! I am totally embarassed. Today, I've checked again and the expected subfolders are where they supposed to be. As it turns out, I have a \Common Files\microsoft shared\Web Server Extensions\14 directory structure under C:\Program Files (x86) and under C:\Programs. The latter ist the correct one.