装了office 2010后，默认新建菜单中的格式都是不带x的，比如docx就是doc，新建Excel后缀也是xls而不是xlsx。

解决这一问题修改注册表就可以了。将下述代码复制到一个txt文件中，修改后缀txt为reg，导入注册表，刷新桌面，即可实现新建文件默认后缀为docx，xlsx和pptx。

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT.doc]

[HKEY_CLASSES_ROOT.xls]

[HKEY_CLASSES_ROOT.ppt]

[HKEY_CLASSES_ROOT.docx]

@="Word.Document.12"

"PerceivedType"="document"

"Content Type"="application/vnd.openxmlformats-officedocument.wordprocessingml.document"

[HKEY_CLASSES_ROOT.docxOpenWithList]

[HKEY_CLASSES_ROOT.docxOpenWithListIllustrator.exe]

@=""

[HKEY_CLASSES_ROOT.docxOpenWithListWordPad.exe]

@=""

[HKEY_CLASSES_ROOT.docxPersistentHandler]

@="{D3B41FA1-01E3-49AF-AA25-1D0D824275AE}"

[HKEY_CLASSES_ROOT.docxShellEx]

[HKEY_CLASSES_ROOT.docxShellExPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.docxShellEx{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}"

[HKEY_CLASSES_ROOT.docxShellEx{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"

[HKEY_CLASSES_ROOT.docxWord.Document.12]

[HKEY_CLASSES_ROOT.docxWord.Document.12ShellNew]

"NullFile"=""

[HKEY_CLASSES_ROOT.xlsx]

"Content Type"="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

@="Excel.Sheet.12"

"PerceivedType"="document"

[HKEY_CLASSES_ROOT.xlsxExcel.Sheet.12]

[HKEY_CLASSES_ROOT.xlsxExcel.Sheet.12ShellNew]

"FileName"="excel12.xlsx"

[HKEY_CLASSES_ROOT.xlsxPersistentHandler]

@="{4887767F-7ADC-4983-B576-88FB643D6F79}"

[HKEY_CLASSES_ROOT.xlsxshellex]

[HKEY_CLASSES_ROOT.xlsxshellexPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.xlsxshellex{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{00020827-0000-0000-C000-000000000046}"

[HKEY_CLASSES_ROOT.xlsxshellex{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"

[HKEY_CLASSES_ROOT.pptx]

"Content Type"="application/vnd.openxmlformats-officedocument.presentationml.presentation"

@="PowerPoint.Show.12"

"PerceivedType"="document"

[HKEY_CLASSES_ROOT.pptxPersistentHandler]

@="{4F46F75F-199F-4C63-8B7D-86D48FE7970C}"

[HKEY_CLASSES_ROOT.pptxPowerPoint.Show.12]

[HKEY_CLASSES_ROOT.pptxPowerPoint.Show.12ShellNew]

"FileName"="pwrpnt12.pptx"

[HKEY_CLASSES_ROOT.pptxshellex]

[HKEY_CLASSES_ROOT.pptxshellexPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.pptxshellex{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{65235197-874B-4A07-BDC5-E65EA825B718}"

[HKEY_CLASSES_ROOT.pptxshellex{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"

如果你要后缀默认是doc,ppt,xls的话,导入下面的代码应该就可以了:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT.docx]

[HKEY_CLASSES_ROOT.xlsx]

[HKEY_CLASSES_ROOT.pptx]

[HKEY_CLASSES_ROOT.doc]

@="Word.Document.12"

"PerceivedType"="document"

"Content Type"="application/vnd.openxmlformats-officedocument.wordprocessingml.document"

[HKEY_CLASSES_ROOT.docOpenWithList]

[HKEY_CLASSES_ROOT.docOpenWithListIllustrator.exe]

@=""

[HKEY_CLASSES_ROOT.docOpenWithListWordPad.exe]

@=""

[HKEY_CLASSES_ROOT.docPersistentHandler]

@="{D3B41FA1-01E3-49AF-AA25-1D0D824275AE}"

[HKEY_CLASSES_ROOT.docShellEx]

[HKEY_CLASSES_ROOT.docShellExPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.docShellEx{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}"

[HKEY_CLASSES_ROOT.docShellEx{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"

[HKEY_CLASSES_ROOT.docWord.Document.12]

[HKEY_CLASSES_ROOT.docWord.Document.12ShellNew]

"NullFile"=""

[HKEY_CLASSES_ROOT.xls]

"Content Type"="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"

@="Excel.Sheet.12"

"PerceivedType"="document"

[HKEY_CLASSES_ROOT.xlsExcel.Sheet.12]

[HKEY_CLASSES_ROOT.xlsExcel.Sheet.12ShellNew]

"FileName"="excel12.xls"

[HKEY_CLASSES_ROOT.xlsPersistentHandler]

@="{4887767F-7ADC-4983-B576-88FB643D6F79}"

[HKEY_CLASSES_ROOT.xlsshellex]

[HKEY_CLASSES_ROOT.xlsshellexPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.xlsshellex{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{00020827-0000-0000-C000-000000000046}"

[HKEY_CLASSES_ROOT.xlsshellex{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"

[HKEY_CLASSES_ROOT.ppt]

"Content Type"="application/vnd.openxmlformats-officedocument.presentationml.presentation"

@="PowerPoint.Show.12"

"PerceivedType"="document"

[HKEY_CLASSES_ROOT.pptPersistentHandler]

@="{4F46F75F-199F-4C63-8B7D-86D48FE7970C}"

[HKEY_CLASSES_ROOT.pptPowerPoint.Show.12]

[HKEY_CLASSES_ROOT.pptPowerPoint.Show.12ShellNew]

"FileName"="pwrpnt12.ppt"

[HKEY_CLASSES_ROOT.pptshellex]

[HKEY_CLASSES_ROOT.pptshellexPropertyHandler]

@="{993BE281-6695-4BA5-8A2A-7AACBFAAB69E}"

[HKEY_CLASSES_ROOT.pptshellex{8895b1c6-b41f-4c1c-a562-0d564250836f}]

@="{65235197-874B-4A07-BDC5-E65EA825B718}"

[HKEY_CLASSES_ROOT.pptshellex{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]

@="{C41662BB-1FA0-4CE0-8DC5-9B7F8279FF97}"