The FreeCOM COPY command doesn't seem to support long file names.

I used FreeDOS 1.3 with doslfn enabled.

I downloaded 7345.epub.images from:

<https://gutenberg.org/ebooks/7345/>

I ran the following batch file:

```
deltree /y meta-inf
deltree /y oebps
del mimetype
unzip -o pg7345-images.epub

copy /y oebps\1778362254498316103_7345-h-0.htm.html oebps\1778362254498316103_73
45-h-0.htm.bak
```

I got the following error output:

```
C:\test>copy /y oebps\1778362254498316103_7345-h-0.htm.html oebps\1778362254498316103_7345-h-0.htm.bak
File not found. - 'oebps\1778362254498316103_7345-h-0.htm.bak'
Out of memory error.
```

I am aware of the following limits:

* Full file path:       80 characters
* Command-line length: 125 characters

This test does not exceed either of those limits.
