Disclaimer : I have absolutely no knowledge whatsoever about South East asian weapons, but, since I have nothing better to do at the moment, I decided to give it a go and try to find more infos about this lovely knife.
I didn't found much, except this parang, bought and used in Borneo by a British Special Forces veteran (
https://bobshepherdauthor.com/2019/04/18/my-parang/).
Imho, the mount and scabbard are kind of similar to your knife (notwithstanding the black tape), and the blade is almost exactly of the same shape; so, maybe Borneo ?
(Again, a completely uneducated guess !)