Please describe the problem:
In Microsoft office, users can save a file as "Microsoft Powerpoint 95" or
"Microsoft Powerpoint 97-2000" which seems to be different than the normal
"Presentation" type.  Beagle hangs while indexing such documents.

Steps to reproduce:
1. Create few slides in Microsoft Office
2. Save the file as "Microsoft Powerpoint 97-2000"
3. do ./beagle-extract-content <saved-powerpoint-file>


Actual results:
command hangs and no output

Expected results:
Either content should be extracted or exception should be thrown.

Does this happen every time?
Yes

Other information:
These files seem to have a different type of file-header or sort of.  Either
beagle should support or just log an exception and skip the file.