₦airaland Forum

http://www.techrepublic.com/blog/10-things/10-plus-ways-to-recover-a-corrupted-word-document/
http://www.doc.repair/
Repair doc file: Although every Word document is different, Word documents that are created by a common version of Word have a common file header. I can't tell you exactly what this header contains, because it varies from one version of Word to the next. What I can tell you is that if you use a file editor to examine multiple known good Word documents, it will quickly become apparent which bits each of the documents has in common.
Once you have determined which part of the file is the header, you can copy the header bits from a known good document and use the editor to paste those bits into your corrupt document, overwriting the existing header in the process.
If the header was the portion of the document that was damaged, this technique will fix the problem.
Although every Word document is different, Word documents that are created by a common version of Word have a common file header. I can't tell you exactly what this header contains, because it varies from one version of Word to the next. What I can tell you is that if you use a file editor to examine multiple known good Word documents, it will quickly become apparent which bits each of the documents has in common.
Once you have determined which part of the file is the header, you can copy the header bits from a known good document and use the editor to paste those bits into your corrupt document, overwriting the existing header in the process.
If the header was the portion of the document that was damaged, this technique will fix the problem.

Following steps, which are generally required for very solution, are shown below:
1. Open MS PowerPoint program. Click on Office button (on top of the left side).
2. A window will be appearing. Now select corrupt PowerPoint file from the system directory.
3. Click on the arrow of Open button. A list will be scrolled down.
4. From the list, click on Open and Repair. After some seconds, the file will be repaired and opened.
Note: Though this solution efficiently works with corrupt files, but if it does not work we must try the following solutions.

1. We should try to open a corrupt file in OpenOffice.org Impress.

2. We should try to open a corrupt file in MS Word. If it gets opened, we can recover at least the text part of the presentation file.

3. We should try to import the slides from the damaged file into a new file.

Time to time such manuals aren't effective repair pptx, then I go to Google or Bing, there I found
http://www.wikihow.com/Fix-a-Corrupted-PowerPoint-PPTX-File
http://www.pptfaq.com/FAQ00108_Recovering_a_corrupt_presentation.htm
https://onlinefilerepair.com/en/powerpoint-repair-online.html