症状：TF400422, TF400423, TF400424: Failed to open in Microsoft Excel (Project, Outlook): Unable to cast COM object of type ‘Microsoft.Office.Interop.Excel(Project, Outlook).ApplicationClass‘ to interface type ‘Microsoft.Office.Interop.Excel._Application‘. This operation failed because the QueryInterface call on the COM component for the interface withIID ‘{00063001-0000-0000-C000-000000000046}‘ failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY))
如下图：
解决方法：
Sounds like you have a problem with your typelib registration. Presumably, the Com interop layer is hitting the registry to try to locate the typelib. It would start by looking under HKEY_CLASSES_ROOT\Interface\{00063001-0000-0000-C000-000000000046}\Typelib.
Removing an Office version and installing an older one, is probably what caused it. The newer version may have left some junk in the registry.
I had the same case, and this is how got over:
Notice the registry keys mentioned eariler:
HKEY_CLASSES_ROOT\Typelib\{00062FFF-0000-0000-C000-000000000046}. There should be a version subkey
If there is more than one version sub key (which is possible if you removed a newer version of Outlook) you should remove the one that refers to the version not installed:
解决安装不同版本office后造成的PIA COM组件调用失败,布布扣,bubuko.com
解决安装不同版本office后造成的PIA COM组件调用失败
原文地址：http://blog.csdn.net/songjialin/article/details/38473239
