[/ Sections start in included files ]
-[include:include1 include_id_unbalanced-inc1.qbk]
+[include:include1 include_id_unbalanced-inc1.quickbook]
[heading:x1 X1]
[endsect]
[heading:x2 X2]
[heading:x1 X1]
[section:sect2 Section 2]
[heading:x2 X2]
-[include:include2 include_id_unbalanced-inc2.qbk]
+[include:include2 include_id_unbalanced-inc2.quickbook]