I'm having a data set composed of 100 txt files all contained in one folder " named Z " & I want to convert them into ARFF format. I'm using Weka tool.

I have done that in 2 ways but in both ways I got an empty ARFF file.

1st way : through Simple CLI contained in weka by using the below : 

java weka.core.converters.TextDirectoryLoader -dir D:\Z > D:\ss.arff

2nd way : through the GUI by trying to load the files using the same above convertor.

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Note : the files are in text format " .txt " but they actually contain numbers not characters

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Is there any way to get through that problem, if anyone can help or support I would be much appreciated.
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Thanks & Best regards,
Mohamed