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The current Tanagra.xla add-in is valid to the 32-bit version of Excel (up to Excel 2010), even if we are working under 64-bit version of Windows. It does not operate on the other hand if we want to connect the 64-bit version of Excel to Tanagra. We must modify the add-in source code. These modifications are needed up to 1.4.41 version of Tanagra. They will be automatically introduced for the upcoming versions . In this tutorial, we show the procedure to be followed for this upgrade. The screenshots have been achieved under a French version of Excel 2007 here, but I think (I hope) that the adaptation to other versions (Excel 2010 and/or other languages) is easy. Thank you very much to Mrs. Nathalie Jourdan-Salloum which has pointed out this problem and has suggested to me the right solution. Keywords : data importation, xls, xlsx, excel file format, macro-complémentaire, add-in, addin, add-on Tutorial : en_Tanagra_Addin_Excel_64_bit.pdf References : Tanagra, " Tanagra add-in for

 Because I have recently updated my operating system (OS), I am wondering how the 64-bit versions of Knime 2.4.2 and RapidMiner 5.1.011 could handle a very large dataset, which cannot be loaded into main memory on a 32-bit OS. This article completes a previous study where we deal with a moderate sized dataset with 500,000 instances and 22 variables. Here, we handle a dataset with 9,634,198 instances and 41 variables . We have already used this dataset in another tutorial. We showed that we cannot perform a decision tree induction on this kind of database without a swapping system, which is implemented into the SIPINA, on a 32-bit OS. We note that Tanagra can handle the dataset, but this is because it encodes the values of the categorical attributes with a byte. The memory occupation remains moderate. In this tutorial, I analyze the behavior of the 64-bit Knime and RapidMiner on this database. I use 64-bit OS and tools, but I have "only" 4 GB of available memory on my perso