Hey there!
I understand how this can be inconvenient. Windev is not something Figma supports, I think their support team will be in a better position to help you.
On my end, I find a guide from Windev that may help you:
Yes, there is a recent change in Figma url and WINDEV can’t manage this correctly.
So you can change URL like @Mari_Ducasse say : change /design/ to /file/