Yes ^^
Options/Preferences/Plug-ins/VST then 'Edit path list' to point Reaper to the VST3 folder.
However, I'm not sure what has happened in your case. Were your plug-ins working ok when they were in (x86), then suddenly stop working? Maybe Reaper lost the pointer to their file, and were you to go through the above, it would have found them.
Nor am I sure why you had to move them to a VST3 folder. Did they start working when you did this?
They were working previously, thanks.