actually no application should require fixed IP addresses set in Windows. There is no direct way to do this. If you are a Windows developer, you may write a small program or script that sets the permanent IP address.
As a second approach you could try setting "ip-win32 netsh" in your client configuration. AFAIK this has the same effect (i.e. it permanently modifies the IP address of the TAP adapter). However, it may or may not work with your Windows version.
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