In setuptools-0.6c3-py2.4 on win32, installing an egg explicitly results in the installed egg directory having different case than installing it with a version requirement. The following example will explain it more clearly: $ C\:/Python24/Scripts/easy_install dist/Replicator-0.3-py2.4.egg Processing Replicator-0.3-py2.4.egg creating c:\python24\lib\site-packages\Replicator-0.3-py2.4.egg Extracting Replicator-0.3-py2.4.egg to c:\python24\lib\site-packages Adding Replicator 0.3 to easy-install.pth file Installed c:\python24\lib\site-packages\replicator-0.3-py2.4.egg Processing dependencies for Replicator==0.3 Make note of the "creating" message above and compare with the same below. $ C\:/Python24/Scripts/easy_install -f dist Replicator==0.3 Searching for Replicator==0.3 Best match: Replicator 0.3 Processing replicator-0.3-py2.4.egg creating c:\python24\lib\site-packages\replicator-0.3-py2.4.egg Extracting replicator-0.3-py2.4.egg to c:\python24\lib\site-packages Adding replicator 0.3 to easy-install.pth file Installed c:\python24\lib\site-packages\replicator-0.3-py2.4.egg Processing dependencies for Replicator==0.3 It looks like SetupTools now attempts to lower case everything, but doesn't in the case of an explicit install. Bug or feature? Thanks, Alex