Reverse Proxy to file with space in name

Hello,

I am currently using Apache 2.0.55 as a reverse proxy. The site that
I am reverse proxying to contains some files that have spaces in the
name. When I try to access these files the space is replaced with %20
but Apache gives me a HTTP 500 error message.

If I access a file with a space in the name not via the Proxy Pass it
loads the file just fine.

I am running Apache 2.0.55 on Solaris 10.

I have this working on Apache 1.3 and I can not see why it is not
working on Apache 2.

Any ideas?

Thanks,
Keith