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Modflow : inconsistency with Vista?


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I noticed in this forum many problems with Vista using SMS or GMS.

I have got one as well using Modflow 4.1.

If I import observation wells from a .xls file, the following message appears

this -> Execute8aProjectName, a WellType......) : Old format or type of library not valid.


As the .xls file seems to be in order, I thought it was a problem of extension file. So I change the extension in .xlsx (created under Vista) and then the file can be imported in Modflow. The problem is that data has been completely changed, and only one column appears.

I tried to move the file location but the problem still remains.

Do you have any idea of a solution? Is this version of modflow not able to be used with Vista?

Thanks for your help

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