Ans: To process CSV files mention *.csv, To process PDF files mention *.pdf
To process all kinds of extensions mention *.*
For dat files you can mention like *.dat and try processing it.
Source Name Mask
Enter a mask used to select the files in the Source Location directory to be processed.
You can use an asterisk as a wildcard match. For example, BA*.TXT causes the system to find all files with type of TXT that start with the two letters BA. Case is significant in matching files on UNIX systems.
You can include one asterisk character "*" as a wildcard in the root of the mask (before the period) and one asterisk character "*" as a wildcard in the file type. Don't use more than one asterisk in each part.
If you leave this blank or use a mask of *.*, the listener selects every file in the directory identified in the Source Location field (skipping over any files that are themselves directories).