This function takes a filename or a file-extension and returns the plugin that can read/write files with that extension in the form of a FREE_IMAGE_FORMAT identifier.

public static FREE_IMAGE_FORMAT GetFIFFromFilename(
	string filename
)

Public Shared Function GetFIFFromFilename ( _
	filename As String _
) As FREE_IMAGE_FORMAT

public:
static FREE_IMAGE_FORMAT GetFIFFromFilename(
	String^ filename
)