At least Chrome uses this:

file:///C:/Users/tempfile.txt

On Fri, Oct 14, 2016 at 1:45 AM, Martin McClure <mar...@hand2mouse.com>
wrote:

> On 10/13/2016 10:35 AM, Damien Pollet wrote:
>
>> Could you give an example what the file:// URLs look like when they
>> contain a drive letter?
>>
>> I'm afraid I don't have any Windows machines handy to see what Internet
> Explorer does, but as far as I can tell an absolute URL compliant with RFC
> 3986 might look something like
>
> file:/c:/foo/bar
>
> A relative URL that fits the URL syntax would be
>
> file:c:/foo/bar
>
> But I'm finding it difficult to tell precisely how RFCs 1738 and 3986
> currently interact.
>
> The discussion in this proposed RFC is somewhat interesting:
> https://tools.ietf.org/html/draft-ietf-appsawg-file-scheme-02, as it
> directly addresses Windows file naming. In appendix B.2, it says
>
> "When mapping a DOS- or Windows-like file path to a URI, use the drive
>    letter (e.g. "c:") as the first path segment. Some implementations
> leave the leading slash off before the drive letter.  "
>
> and appendix C.1 deals with DOS file paths.
>
>
> I hope this is more helpful than it is confusing.
>
> Regards,
>
> -Martin
>
>
>

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