Flash MX 2004.
fl.createNewDocListType
Read-only property; an array of strings that represent the file extensions of the types of documents that can be created. The entries in the array correspond directly (by index) to the entries in the fl.createNewDocList array.
The following example displays the extensions of the types of documents that can be created, in the Output panel:
fl.trace("Number of types " + fl.createNewDocListType.length);
for (i = 0; i < fl.createNewDocListType.length; i++) fl.trace("type: " +
fl.createNewDocListType[i]);