When I open my Excel file and type in the password (my file is protected) than I get a message 
Excel has found information that cannot be read in [name of my file]. Do you want to recover the contents of the file? If you trust the origin than press YES
So I press YES and the file opens (aparently without any info lost and get the message 
Excel could open the file repairing the file or deleting the contents that could not be read
More details I get: 
Registros reparados: Vista de /xl/worksheets/sheet15.xml parte
.
I can click on more details and get: 
 
 <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> 
- <recoveryLog xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
 <logFileName>error040320_02.xml</logFileName> 
 
 <summary>Se han detectado errores en el archivo "C:\Users\Christophe\Documents\DW\Inventario.xlsm"</summary> 
 
- <repairedRecords summary="A continuación se muestra una lista de reparaciones:">
 <repairedRecord>Registros reparados: Vista de /xl/worksheets/sheet15.xml parte</repairedRecord> 
 
 </repairedRecords>
 
 
 </recoveryLog>
When I close the file and safe the changing and wants to open again I get exactly the same error.

Does somebody have an idea what this error means and how it can be repaired?