Helium Scraper

this may be outside of what helium can do, but is it possible (maybe through javascript) to run an external application?

I don't think this is possible. Why do you need to do this?

Pretty much I have a scrape that runs every hour, and that exports the data at the end. What I was trying to do was have it automatically launch a macro I made (a .exe file) once it is done. The macro automatically opens up the export and does a bunch of other macros in excel generates tax, toals, cancellation dates, etc.). Once that excel macro does that, it runs another macro that imports the cleaned up excel file into our CRM system. It's a pretty intricate process. I bypassed this by setting up another program to look at the export file, and just run the macro any time the file's "modified time" is changed. Kinda a little work around but it works great

Since you can run Helium Scraper from the command line (there are a bunch of options also, see the documentation), perhaps you could use Windows Task Scheduler to run HS and then, when HS closes (you can set it to close after it's done extracting with the command line options too), start your other application.