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Source: Microsoft Support
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On a Windows Vista computer, you click a hyperlink to a .wpl file. If the HTTP header returned from the server contains content-disposition with a file name that includes encoded characters (for example, testwpl_02%2B02%2B2009.wpl), then Windows Media Player may report the following error:
“Windows Media Player cannot find the file. If you are trying to play, burn, or sync an item that is in your library, the item might point to a file that has been moved, renamed, or deleted.”
This problem is caused by a compatibility issue between Windows Media Player and Internet Explorer 7 on Microsoft Vista.
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
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
On the Edit menu, point to New, and then click Key.
To name the new subkey, type the following and then press ENTER:
On the Edit menu, point to New, and then click DWORD Value.
To name the new entry, type the following and then press ENTER: wmplayer.exe
On the Edit menu, click Modify.
Type 1, and then click OK.
Exit Register Editor.
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