Windows 7 seemed to have a bug when it came to reading PDF files in the preview handler, in Windows Explorer Itself and in Outlook. Found the fix on MSOutlook.info
This should work directly on a 32-bit version of Windows with the latest version of Adobe Reader or Adobe Acrobat installed. Sadly, the installer from Adobe does not write the correct registry setting to also enable the previewer on a 64-bit version of Windows.
To fix this registry issue, you can download the fix. It will add the following registry entry;
Key: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}
Value name: AppID
Value type: REG_SZ
Value: {534A1E02-D58F-44f0-B58B-36CBED287C7C}
Note: This will also enable the PDF Preview feature in Windows Vista and Windows 7 itself.
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