lua io.popen runs a program with space on the route

I'm trying to get this program started, but I'm still receiving an error.
I have already tried to make the blockquotes. [==[]==]around the chain and "" around the program path but it still does not work.

local test = string.format ([==["C:Program Files (x86)Audacityaudacity.exe" "F:Aufnahme %s.%s.%sZOOM0001.WAV"]==], label, monat, jahr)

print (test)
io.popen (test)

error when executing the lua file

If I copy the print command (test) and use it in cmd.exe, it works.