Connecting to text files can sometimes be more challenging than connecting to a database or server-based data source. Relational databases will typically have the data types and constraints built in. Tableau can read this metadata and interpret the correct types and settings for the data set.
Text files can be tricky. We usually need to identify delimiters (that is, how is one field separated from another). If we want headers, we will need to either manually assign them from within Tableau, or override them in a configuration file.
If we connect to the file from Tableau without a configuration (or schema.ini) file, this is what we will get:
There are a few things that are incorrect or missing: ...