Naming conventions:
Product_type_h/wRevision_s/wRevision_ValidArea_language_datecode.extension
Product_Howto_language_ Theme-with-description.extension 



DFE-550fx_ce_reBb1_ce_en_050101.pdf		CE-Declaration.

DFE-550fx_ds_revALL_100_ALL_en_050101.pdf	Datasheet.
						Englisches Datenblatt.