How do I open an encrypted xls-file?

I have a sudden problem with xls-files that just started to bather me. I have used iWorks and Numbers for 5 years now and this is the first time I have faced problems with xls-files. Let me explain. On my work iMac I try to open a saved xls-file ( that I have received via e-mail and saved on my hard drive ). When opening it, the following text appear: " The file is encrypted and cannot be opened ". This occur with all xls-files - not just one. Have I done something to the preferences or ....
What should I do ?

Same problem here, but file author says not encrypted, but does contain locked cells.
Could be Numbers can't read locked cells?

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