Certain authorities use other SWMM-based software for review purposes or as their city-wide model that needs to be updated. We need to export a SWMM file for more universal submittal purposes, even if InfoDrainage uses a modified SWMM engine.
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Thank you for the suggestion and thanks to those who voted
Although there is a workaround for this, I am pleased to announce that this is now under consideration and it's being discussed internally for future implementation.
You can toggle IFD to save the SWMM5 INP file and SWMM5 RPT file to a folder. Once in the folder, you can use the input file with SWMM5. Of course, any extra sections for IFD will not be used in SWMM5 but ignored. Here is a KCS article in the IFD help file that explains this https://knowledge.autodesk.com/article/How-to-enable-RPT-and-INP-files-for-InfoDrainage