Since NAV2009 it is not possible to run your objects in older NAV versions. NAV will crash if you run your object in e.g. NAV5.0. The only way to import your objects in older versions is in text format. The Downgrade Objects tool let you downgrade your objects to older NAV formats. When you convert to e.g. NAV4.0 format the FINDSET en FINDFIRST will be replaced by FIND('-') and non-supported elements and properties will be removed.
Select File Functions > Convert Objects to open the Convert Object window.