Yep. all synths with patch memory have to have a internal battery to keep the memory intact when the unit is unplugged from the mains. Eventually that battery dies and is what causes the patches to all disappear or go bad. If you have lost the internal patches like you have you should open it up and replace the battery you find inside.

Those files you sent me are sysex files and can be transmitted to your Vintage Keys using any software with sysex transmit capability.