I should clarify why I would want to do this.
The best way to clone a partition is when it is not in use. If no files are open, nothing is being changed while the source is being copied.
So this way the target machine I want to convert is simply treated as "data disks" to WinPE and has no files in use when cloned by Converter.
However Converter doesn't give the ability to choose which Windows partition installation to modify on the source server, to change drivers or anything else. It assumes the booted Windows OS (WinPE) is the OS to be converted and modified, when in fact I don't want to migrate WinPE at all, and if it is required to be copied, I will discard it as a temporary partition not needed on the final converted VM.
So, need to run VMWare Tools on the source machine before conversion so those drivers will already be present when the unmodified partitions are migrated by Converter.