The example ppt-files are located in the subdirectory
src/plugins/parse-mspowerpoint/samples. They are
copied by the ant-task to the directory
src/plugins/parse-mspowerpoint/data for testing.
Additionaly to the ppt-files, there could also be stored files with
the same name with postfix ".content" or ".title". If they exists,
the test classes are checking the extracted content against these