Manually duplicating a platform under a different name

[SiriusVI]

Hey,

for testing purposes, I want to duplicate a MS-DOS Platform that I have. I can't reimport all the games, I need the platform to be an exact copy, with a different name, e.g.: MS-DOS-Test. So what I did was just copy the MS-DOS Platform, renamed it to MS-DOS-Test and changed all the instances of "MS-DOS" in the xml file to read "MS-DOS-Test". That didn't work, so I also manually added the platform in the platforms.xml file, but that also didn't work.

Can anyone tell me what I need to do to duplicate a platform?

Thx!