This is what the export template looks like (although it doesn't have the lastn="1000" in it, because it actually loops through each of the entries using the Perl API). But the following should work.
CODE
<MTEntries lastn="1000">
AUTHOR: <$MTEntryAuthor$>
TITLE: <$MTEntryTitle$>
PRIMARY CATEGORY: <$MTEntryCategory$>
<MTEntryCategories>
CATEGORY: <$MTCategoryLabel$>
</MTEntryCategories>
DATE: <$MTEntryDate format="%m/%d/%Y %I:%M:%S %p"$>
-----
BODY:
<$MTEntryBody convert_breaks="0"$>
-----
EXTENDED BODY:
<$MTEntryMore convert_breaks="0"$>
-----
EXCERPT:
<$MTEntryExcerpt no_generate="1" convert_breaks="0"$>
-----
<MTComments>
COMMENT:
AUTHOR: <$MTCommentAuthor$>
EMAIL: <$MTCommentEmail$>
IP: <$MTCommentIP$>
URL: <$MTCommentURL$>
DATE: <$MTCommentDate format="%m/%d/%Y %I:%M:%S %p"$>
<$MTCommentBody convert_breaks="0"$>
-----
</MTComments>
--------
</MTEntries>