Hello gordy,
Thanks for information. If you are using the 64-bit version of EmEditor, can you try this instead:
start /wait ee128.exe
(ee128.exe can be ee256.exe if the CPU supports AVX2, or ee512.exe if it supports AVX512)
This is because emeditor.exe is just a shim app that actually calls ee128.exe (ee256.exe or ee512.exe) and terminates itself immediately.