Thanks so much for posting this. I spent the last hour doing all sorts of things to find out why MS Edge started tossing an error stating blah blah can't start due to SIDE by Side error (to paraphrase).
I followed all sorts of diag suggestions using command prompts and what not and ended up with a hail Mary by just
deleting all the MS Edge folders and then re-installing MS Edge with the manual installer download.
It then tossed the error above, cannot find msedge_no_ifeo.exe, not the side by side config error. More hair pulling and a DuckDuck Go search for msedge_no_ifeo.exe phrase alone lead me here.
Not recalling if I had ever installed such an app I searched my Apps under uninstall panel and sure enough that
app had been installed at some point. Deleting it solved the launch MS Edge issue.
NO idea why that started blocking MS edge from launching all the sudden but it did.
Perhaps it was the cause for the original issue side by side error as well.