The file still exists on the mac... it is just named MacFilecache-#######.dat
Where are you looking for the file. It should be in the user configuration folder where extensions are installed.
Mac OSX;
-DW8
--Hard disk: Users: <Your User Name>: Library: Application Support: Macromedia: Dreamweaver 8:Configuration
-DWCS3
--Hard disk: Users: <Your User Name>: Library: Application Support: Adobe: Dreamweaver 9: Configuration
-DWCS4
--Hard disk: Users: <Your User Name>: Library: Application Support: Adobe: Dreamweaver CS4: en_US: Configuration