Hey,
I got a content model working for me with custom aspects and properties defined for files.
I want to search for properties now.
Found out, that I can override search config files. But I can't figure them out in Alfresco 5.1f.
I also saw that there is a possibility to use search filters. But my custom properties didn't appear in the list 'filter by properties' .
Maybe you guys could help 
Thanks in Advance