Here's a bit more elaboration on the wildcard character on the Filter text line. You don't need to always list every "*.net" file. You may know that the file you are looking for begins with "R". In that case, you can modify the Filter entry (by typing), to read:
/somepath/somedirectory/R*.net
then press the Filter button or hit Enter to make the change take effect. The File list will then show any, all, or no (if there aren't any) files that begin with "R", have zero or more characters after the "R", and end in ".net" found under /somepath/somedirectory.
There will also be times when we want to open other types of files in similar dialog boxes. For example, we'll soon learn to use the Import module to bring data files into DX. Standard (or "native") Data Explorer data files end in the suffix ".dx"; files created by the Data Prompter end in ".general". It is also possible to read in image files and plain text files with certain other modules. If you need to read in a ".general" file, but the Filter is filtering out all but ".dx" files, you will not see the ".general" file listed even if it is in the directory you are searching. Keep this in mind, and note that you will have to modify the Filter text entry in this case to read:
/somepath/somedirectory/*.general
It's easy to forget and can be frustrating if you are sure the file is there but DX just won't list it for you!
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How would you set the wildcard to find any file regardless of its suffix? How about any file whether it has a suffix or not? Does the fact that DX lists a file mean it is necessarily "openable" by DX?
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