[mew-int 2925] bug with viewing attachment with a space in the name

hi!

When doing C-c C-e on an attachment to view it with external program, it doesn't work if there is a space in the name of the attached file.   For example with attachment "Example\ File.png" C-c C-e does "qiv Example" and not "qiv Example\ File.png".  Is it possible to make this work in the next versions?

thank you,

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