proplem opening a .dat file with excel

I am unable to open a .dat file using excel, the error "filename.dat is not a valid win32 application". Might anyone know how I can resolve this?
ELGowenAsked:
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Hendrik WieseInformation Security ManagerCommented:
Try the following
1. Click File > open
2. Select type: all files (*.*)
3. browse to where it is and open it.
 
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Hendrik WieseInformation Security ManagerCommented:
Sorry misread your question. Can you open other files using excel?
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ELGowenAuthor Commented:
Hi there,  the problem only seems to be with 1 persons pc, its is opening under excel when I use the steps that you suggested, I will need to play around with the format a bit but at least it is opening. Thanks for your help
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