Unable to perform Calculations on Excel exported from Web Dynpro ABAP

Hi Gurus,
I have a custom functionality "Export to Excel" internal table data on my web dynpro application. I dint go with standard ALV feature because it doesnot give flexibility to add colours to excel sheet and add multiple tabs and so i had to write XML ABAP coding in the web dynpro application to achieve this. While passing the internal table data into cells, i created cells with string data type and hence all the fields in the excel are now in char type. Users are unable to perform any calculations because of this issue, i tried to format the cells but it doesnot work. Please help me.
Regards,
Pravs.

Hi,
Just do the following in excel before downloading and check whether it works.
Tools->Options->International tab.
In that mention decimal separator as ,(comma).
Thousand separator as .(dot).
Uncheck use system separators.

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@Ruslim Chang
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