The SWMM 3 and SWMM 4 converter can convert up to two files at one time to SWMM 5. Typically you would convert a Runoff and Transport file to SWMM 5 or a Runoff and Extran File to SWMM 5. If you have a combination of a SWMM 4 Runoff, Transport and Extran network then you will have to convert it in pieces and copy and past the two data sets together to make one SWMM 5 data set.
The x,y coordinate file is only necessary if you do not have existing x, y coordinates on the D1 line of the SWMM 4 Extran input data set.
You can use the command File=>Define Ini File to define the location of the ini file. The ini file will save your conversion project input data files and directories.
You can use the command File=>Define Your Text Editor to define the location of the text editor program. The ini file will save your conversion project editor name.
You can get a copy of the latest SWMM 3,4 to 5 Converter Here..