Outlook 2013 can’t preview Office files

1. Quit Outlook.
2. Go to Start, type regedit.exe and click on it. (if you don't have administrator access -> right click on regedit.exe and click "Run as Administrator")
3. Follow the path HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PreviewHandlers.
4. Here you will find multiple strings. Delete Microsoft Excel/Powerpoint/Word previewer.
5. At this point if you enter outlook and try to preview an error will show up, that previewer is not installed.
6. Remake the strings. Go back to the path above.

a. Right click-> New-> String Value and enter this text: {00020827-0000-0000-C000-000000000046} Right click on the string-> Modify and under Value data type : Microsoft Excel previewer

b. Right click-> New-> String Value and enter this text: {65235197-874B-4A07-BDC5-E65EA825B718} Right click on the string-> Modify and under Value data type : Microsoft PowerPoint previewer

c. Right click-> New-> String Value and enter this text: {84F66100-FF7C-4fb4-B0C0-02CD7FB668FE} Right click on the string-> Modify and under Value data type : Microsoft Word previewer

Open Outlook and try to preview a file. Let us know if it worked.