MkVimball doesn't work on windows

I'm using gvim 7.3.107 on Win XP with vimball v32c

If I have the following file:
--------------------
autoload\dbext.vim
autoload\dbext_dbi.vim
doc\dbext.txt
doc\dbext_gpl.dat
plugin\dbext.vim
--------------------

and do %MkVimball! dbext
I'm getting:

***vimball*** unable to read file<autoload\dbext.vim>

but if I do gf I can read the file!

I changed \ to / but the result is the same.

Many thanks in advance,

--
Cesar

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