Library looking for .ARW instead of DNG

Logn story short. Converted my ARWs (Sony RAW) to DNGs. Lost the library, have a backup but it points out to the original ARW files. I can locate the files manualy but Lightroom tells me it's not the correct name (1234.DNG instead of  the 1234.ARW it is looking up) so, it only pics that picture instead of the whole bunch on that same folder.

Is there a way to edit the library to make it look for DNGs instead of ARWs?