Excel Can't preview the files in Outlook:
11. Exit Outlook.
2. Start Registry Editor. To
do this, use one of the following procedures, as appropriate for your version
of Windows:
In Windows 10, press the Windows key + R to open a Run a dialog box, type regedit.exe, and then click OK.
In Windows 7, click Start, type regedit.exe in the search
box, and then press Enter.
33. Locate and then select one
of the following registry keys, depending on the type and bitness of the
products that you are using:
For a Click-to-Run installation of any bitness of Outlook
and Windows, locate and then select the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\PreviewHandlers
For an MSI installation of 32-bit Outlook on 64-bit Windows,
locate and then select the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\PreviewHandlers
For an MSI installation of 32-bit Outlook on 32-bit Windows or
64-bit Outlook on 64-bit Windows, locate and then select the following registry
key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PreviewHandlers
44. Locate the value that has
the following name, and then view its Type:
{00020827-0000-0000-C000-000000000046}
Note Depending on whether this value exists and what its
Type is, take one of the following actions:
If the Type is anything other than REG_SZ, go to step 5.
If the Type is REG_SZ, go to step 8.
If this value does not exist, go to step 6.
55. Right-click the
{00020827-0000-0000-C000-000000000046} value, select Delete and then click Yes
to confirm the deletion.
66. On the Edit menu, select
New, and then click String Value.
77. Type the following text,
and then press Enter.
{00020827-0000-0000-C000-000000000046}
88. Right-click
{00020827-0000-0000-C000-000000000046}, and then click Modify.
99. In the Value data box, type
the following text, and then click OK.
Microsoft
Excel previewer.
10. On the File menu,
click Exit to exit Registry Editor.