document with absolute path

Hi,

I am trying to open a file using document and would prefer absolute
path. I am using saxon under windows (with cygwin) as you can guess
from my uri. Before I did it with relative path, then it worked, but
now not anymore. What am I doing wrong?

B B B  B B B  <xsl:variable name="dictloc"
select="document('File:///c:/cygwin/home/Mengel/usr/levelup/lib/mpxvok.xml')"
/>
....
B B B  B B B  B B B  <xsl:when test="exists
($dictloc/mpxvok:mpxvok/mpxvok:context[@name eq $dictname])">

When I enter File:///c:/cygwin/home/Mengel/usr/levelup/lib/mpxvok.xml
in explorer it opens the right file.

Thanks!
Maurice