$ExportFormats
gives a list of export formats currently supported in your Wolfram Language session.
Examples
open allclose allProperties & Relations (1)
$ImportFormats lists formats supported by Import:
Wolfram Research (1999), $ExportFormats, Wolfram Language function, https://reference.wolfram.com/language/ref/$ExportFormats.html.
Text
Wolfram Research (1999), $ExportFormats, Wolfram Language function, https://reference.wolfram.com/language/ref/$ExportFormats.html.
CMS
Wolfram Language. 1999. "$ExportFormats." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$ExportFormats.html.
APA
Wolfram Language. (1999). $ExportFormats. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$ExportFormats.html