You cannot find an Office file that contains special characters in its file name in a SharePoint 2010 document library

To resolve this issue, apply the following update:

2553299 Description of the Office 2010 hotfix package (Filterpack-x-none.msp): April 9, 2013

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

After you install the hotfix package, follow these steps to enable the hotfix:

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then select the following registry subkey:
   HKEY_LOCAL_MACHINE\Software\Microsoft\Office\14.0\Common\
3. In the Edit menu, point to New, and then click DWORD value.
4. Type SkipNameValidation, and then press ENTER.
5. In the Details pane, right-click SkipNameValidation, and then click Modify.
6. In the Value data box, type a nonzero value, and then click OK.
7. Exit Registry Editor.

Note In order to search for Office files in a .zip compressed file that were uploaded and indexed before you install the hotfix package, you have to perform a full search after you install the hotfix package and set the above registry key.