Microsoft has some recommended methods for recovering
from PowerPoint presentation corruption here,
http://office.microsoft.com/en-us/powerpoint-
help/recover-a-corrupt-powerpoint-file-
HA001116878.aspx. S2 Recovery Tools for Microsoft
PowerPoint provides easy access to most of these,
allowing them to be engaged with pushes of buttons.

The program also adds four of its own independent
methods. These independent methods include two text,
slide and format recovering methods for PPTX files
which repair all the salvageable underlying XML
subfiles as well as the higher level conventional zip
structure of these presentations.

The program also has links to three major commercial
solutions. One of these is a web service provided by
Recoveronix', Online File Repair. With the provided
coupon code, until Nov. 1, 2013, the service is free,
a $39 value.

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