Windows filepaths break the "open images" script?

[emmastanford]

Using the win32-x64 binary on Windows 10, I get an error when I try to open local images:

Uncaught SyntaxError: Unexpected token U in JSON at position 87
    at JSON.parse (<anonymous>)
    at Object.parseRecursion [as parse] (C:\Users\me\Downloads\Mirador Desktop-win32-x64\resources\app.asar\…:182)
    at EventEmitter.ipc.on (index.js:144)
    at emitMany (events.js:127)
    at EventEmitter.emit (events.js:201)

This links to VM260:3 in the debugger, which shows a problem with this line in the generated manifest:

"@id": "file:///C:\Users\me\Downloads\Mirador Desktop-win32-x64\Mirador Desktop-win32-x64\resources\app.asar/986c437c-8b67-4a6b-baa0-50ae71d30b30/manifest.json",

...which leads me to think it's because the app is concatenating forward slashes on top of Windows backslashes in the json filepath, which seems to be set at

mirador-desktop/app/main.js

Line 60 in 59d6c1d

const manifestUri = urljoin('file://', __dirname, manifestId, 'manifest.json');

. I don't know if this is really the problem though.