B4X FEED B4j xlutils create file Excel

[practicalsoft]

Hello at all,

i created a file excel in B4j with library xlutils, but when open the file with Excel, he tell me "error the format and the estension not correspond.
the file i corrupt ecc..."

but if i answer yes if i want to open the file the same all is ok.

What can i do ?

Thank you very much

Maurizio

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