Merge 10 000+ files isn't work for text editor.

There are possibility like use CAT (you need to find it for Win), or user
Get-ChildItem -path i:  est -recurse |?{ ! $_.PSIsContainer }
|?{($".html")} | %{ Out-File -filepath i:      est
-inputobject (get-content $_.fullname) -Append}

But it's slow.

The fastest way is temporary copy all files into one folder, use COPY command
and delete your files.

I won't add this functionality for your one time usage.

PSPad freeware editor

Odpovedet emailem