What is the image format identified as 'greenshot' in Preferences/Output?

Description

I want to specify screenshot output format. The Preferences/Output dialog shows a list of image formats, one of which is 'greenshot'. This image format is not defined in the Help. Can you tell me what it is?
Thanks

Environment

Windows 7 Home Premium 32-bit
DELL Laptop E6400
DELL monitor 22"
Greenshot 1.2.10 build 6

Assignee

Unassigned

Reporter

nick corbin

Components

None

Affects versions

None

Labels

Priority

Minor
Configure