ruby xmpfilter on windows

Question

Has anyone out there ever gotten xmpfilter to work on windows?

xmpfilter "unterminated string meets end of file"

is the error. The only Google hit is in Japanese:

google://xmpfilter "unterminated string meets end of file"

http://www.unkar.org/read/pc12.2ch.net/tech/1249687283

For background, the desired feature from xmpfilter is to get automatic "eval" annotations of Ruby sourcecode:

Before:

a = "bravo alpha charlie"     # =>
b = a.split                   # =>
b.sort!                       # =>

After:

a = "bravo alpha charlie"     # => "bravo alpha charlie"
b = a.split                   # => ["bravo", "alpha", "charlie"]
b.sort!                       # => ["alpha", "bravo", "charlie"]