Here is a work around for import .edz files to EPLAN 2.2.
Rename the edz file to zip.
Use winrar to unzip it.
In EPLAN, 
   + open part management dialog: Utilities -> Parts -> Management
   + open import records diaglog: Extras -> Import
   + Select file type: XML
   + Select file name: look for xml file in subfolder "items\partxml\" in extracted folder
   + Press OK to import.
Hope this help
Checked with EPLAN 2.2 and edz file downloaded from Siemens support site.
