[plt-scheme] collection not found: "planet" on Windows ...

I'm using 299.400 on Windows, installed from the binary installer.

I've got a batch file that does this

     mzscheme -qu "%USERPROFILE%\local\bin\filter-firefox-bookmarks.ss"

(I've attached the file itself if you're interested)

On Windows, when I run the batch file, I see this:

    C:\Documents and Settings\erich.WA>filter.cmd

    C:\Documents and Settings\erich.WA>mzscheme -qu "C:\Documents and Settings\erich.WA\local\bin\filter-firefox-bookmarks.ss"
    standard-module-name-resolver: collection not found: "planet" in any of: (#<path:C:\Documents and Settings\erich.WA\Application Data\PLT Scheme\299.400\collects>)

Oddly, though, if I open the Scheme program in DrScheme ("module"
language) and click the "Run" button, it works fine.

It also works fine on *nix from the command line.

What might be causing this?

And is it my imagination, or is that list of paths suspiciously short
(i.e., contains just one entry)?

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