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How to workaround failures with Unicode filepaths?

Posted 2 years ago
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(Cross-posted from Mathematica.SE)

The Mathematica's Kernel and FrontEnd currently work well with Unicode file/directory paths, but some other components of the system contain long-standing bugs which are source of troubles for the users, especially for the users from non-English-speaking countries.

The most recent version of Mathematica 11.2.0 still fails to Import a PDF file when its path contains non-ASCII characters: under Windows Import returns $Failed, under OSX it returns empty list. This is due to a long-standing bug in the component "PDF.exe" which is responsible for importing of PDF files:

Export["Тест.pdf", Plot[Sin[x], {x, 0, Pi}]]

The same is true for Importing Mathematica's native NB files as "Plaintext" due to a similar long-standing bug in "NBImport.exe":

Export["Тест.nb", Plot[Sin[x], {x, 0, Pi}]]
Import["Тест.nb", {"NB", "Plaintext"}]

The new in version 11 HTTPRequest/URLRead functionality also suffer from this bug. Here is an attempt to upload an image with non-ASCII filename to using the method from this answer:

Export["Тест.png", Plot[Sin[x], {x, 0, Pi}]]

  "", <|
   "Body" -> {"image" -> <|"Content" -> File["Тест.png"], "MIMEType" -> "image/png"|>}|>]]


And undoubtedly there are other components suffering from this bug because reports about problems with Unicode filepaths keep appearing on Mathematica.SE:

In the original dedicated Mathematica.SE thread two workarounds are given, each of which has its own set of limitations/drawbacks. Are there some other, potentially better ways to avoid failures with Unicode file/directory paths?

Reported to the support as [CASE:3965891].

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