Hello,
there are two tools to import the data i.e using DTW and using DI API (addon to import a txt file). For the first tools, you have SDK help center file as a literature. For the seconds, you need to know the programming language like VB.Net, VB6, etc
Based on the tools, you could import what you want and use the help file to find out the properties of the column/field for example maximum characters, is it strings, long etc.
Rgds,
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