Windows Instances launched using RegisterImage API are showing PlatformDetails as "Linux/UNIX" and are not booting - when the EBS volume snapshots are created using StartSnapshot() API

Steps to reproduce:

1. Create a Windows Instance with a single EBS volume (aka root volume)
2. Take a snapshot of the root volume (Snap-1)
3. Create a new EBS snapshot (Snap-2) using StartSnapshot API with the Snap-1 as parent snapshot.
4. On Snap-2, issue CompleteSnapshot API with 0 changed blocks.
5. Create an AMI using RegisterImage API with Snap-2 as the root volume and same block device mapping as the original instance.
6. Any instance created using the AMI has "Linux/UNIX" in Platform Details and does not boot.

It was observed that this issue occurs only if the EBS snapshot used is created using StartSnapshot API. For example, if Snap-1 was used in the RegisterImage call, any instance created using the AMI is showing platform as "windows" and is booting up properly.

Question: Is there any way to create a Windows AMI (that creates bootable windows instances) using EBS snapshots created via StartSnapshot API or is there any workaround for this ?