Use font name with spaces in pdf mapline in dvipdfmx

[Xiangdong Zeng]

We can use the following code (in upLaTeX) for dvipdfmx to map fonts:

\special{pdf:mapline upserif-h UniGB-UTF16-H FandolSong-Regular.otf}

However, what about if the font filename contains spaces? For example,
the "STHeiti
Light.ttc" in macOS. I have tried add quotation marks, braces and even
\detokenize, but none of them can work. Is it just impossible to do so?

Thank you,
Xiangdong
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