Assuming a data directory with two files, "mydata1" and "mydata2.csv", when attempting to import files with the flat file importer of Teiid Designer, only "mydata2.csv" will be discovered and selectable in the import process. It is not possible to discover/select files without extensions in the flat file importer, since available file name filters are only ".csv", ".psv", ".ssv", ".tsv", ".txt", and ".". "" (no extension) is necessary. It is found in Teiid Designer, however, it is not an issue only concerning Teiid Designer, but a general issue, because a general file selection UI can not show files without extensions. There is no reason to consider a file without extensions as a non-text file.