Microsoft Office Excel cannot access the file 'c:\temp\test.xls'. There are several possible reasons:
• The file name or path does not exist.
• The file is being used by another program.
• The workbook you are trying to save has the same name as a currently open workbook.
• The file name or path does not exist.
• The file is being used by another program.
• The workbook you are trying to save has the same name as a currently open workbook.
Por mágica que parezca la solución, está reside en crear una nueva carpeta llamada Desktop en C:\Windows\SysWOW64\config\systemprofile\, quedando de esta manera:
C:\Windows\SysWOW64\config\systemprofile\Desktop
Hay que dar permisos "Control Total" a esta carpeta de la aplicación del IIS (AppPool) de la aplicación web que usa la API Excel 2007. Debe utilizar internamente esta carpeta de forma temporal para realizar la lectura del xlsx.
Aquí tenéis parte de dónde encontré la solución, que nos dice que la creación de la carpeta varia dependiendo la versión del servidor:
...
・Windows 2008 Server x64
Please make this folder.
C:\Windows\SysWOW64\config\systemprofile\Desktop
・Windows 2008 Server x86
Please make this folder.
C:\Windows\System32\config\systemprofile\Desktop
...instead of dcomcnfg.exe.
...
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