Assume that you insert an attachment into a Rich Text Format (RTF) email message in Microsoft Outlook 2010 or Microsoft Outlook 2013. When you print the email message, the attachment icon has a black background. Therefore, you cannot read the file name of the attachment.
Registry key information
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
For Outlook 2010, the DisableAttachmentTransparency registry setting was introduced with the Microsoft Outlook 2010 hotfix package dated June 18, 2011 (KB2544026). For more information about the hotfix package, click the following article number to view the article in the Microsoft Knowledge Base:
2544026 Description of the Office 2010 hotfix package (mso-x-none.msp): June 28, 2011
After you install the hotfix package, follow these steps to enable the hotfix:
Click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then select the following registry subkey: