Hi @Xiaobo Ban
Have you done anything before this issue occurred, such as updating Office, installing third-party software, etc.?
Is WPS installed on the computer at the same time? If so, please uninstall it.
Then please go to "Registry Editor", check whether there are related previewer registry values:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PreviewHandlers
Value Name: {00020827-0000-0000-C000-000000000046}
Type: REG_SZ
Data: Microsoft Excel previewer
Value Name: {84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}
Type: REG_SZ
Data: Microsoft Word previewer
Value Name: {65235197-874B-4A07-BDC5-E65EA825B718}
Type: REG_SZ
Data: Microsoft PowerPoint previewer
Then go to following locations, ensure the "(Default)" Data of {8895b1c6-b41f-4c1c-a562-0d564250836f} registry key is correct for each Office file format.
-
Computer\HKEY_CLASSES_ROOT\.xlsx\ShellEx\{8895b1c6-b41f-4c1c-a562-0d564250836f}
--- {00020827-0000-0000-C000-000000000046}
-
Computer\HKEY_CLASSES_ROOT\.docx\ShellEx\{8895b1c6-b41f-4c1c-a562-0d564250836f}
--- {84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}
-
Computer\HKEY_CLASSES_ROOT\.pptx\ShellEx\{8895b1c6-b41f-4c1c-a562-0d564250836f}
--- {65235197-874B-4A07-BDC5-E65EA825B718}
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