3
You'll need to install an app for this as this seems not to be possible out of the box. Total Commander should be able to access network shares - there are probably a few others as well.
2
There are two solution for you,
Solution 1:
Since the download is incomplete the file may be possibly be in Internet Explorer cache.
Open Internet Explorer.
Clear all browsing data.
Solution 2:
This process involves accessing system files so proceed with care.
Unlock your Windows phone(normal screen unlock).
Connect your phone to a Linux OS.
You can ...
2
Unfortunately, you cant do that on phone.
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