If the rooting method prevents MTP from working, then
another means might be needed.
For Windows, MTP is "Media Transfer Protocol". It's a protocol that
works at a file-by-file level, so you're not dealing with a file system
as such. All it does, is provide a means to read() or write() a
particular file. And do it in such a way, as devices at either end
don't have to stop doing anything, to use the protocol. (USB Mass storage
on the other hand, only allows one agent to write to storage at once, so
the processor on the other end effectively has to stop doing what it
wants to do, in order for USB Mass Storage to be possible via an external
device. This is why, when my Digital Camera mounts, the processor in the
camera is effectively shut down.)
Windows supports IFS (Installable File System). That allows software like
EXT2IFS to actually mount an EXT (possibly Linux) volume, right from Windows.
I used to run that at one time, but it supports a very early version of EXT
and that has consequences. It would have needed further development work
to stay up-to-date.
In the thread here, I get the impression that *some* utility exists for
working with an Android, when MTP is out of the picture. But it does
not amount to actual mounting. The utility may allow reading or
writing with the utility itself, but without the Windows File Explorer
showing the device graphically.
https://android.stackexchange.com/questions/89501/windows-mount-android-file-system
http://www.guidingtech.com/16174/mount-android-windows-root-file-system-access/
[I think these are supposed to be Windows utilities...]
http://android-commander.en.lo4d.com/
http://de.codeplex.com/ <=== Is CodePlex still up ??? Dunno.
On Windows, MTP is likely to be seamless on Windows 10, but is a
royal PITA on WinXP. It's installable on WinXP, but a lot of people
have trouble with that, getting the details right.
When you root your device, you should be consulting the README as
to what the side-effects will be. What new comm channels will open,
and what other methods will be shut. Rooting, in a minor way, is
almost like an ecosystem change, and is worth studying before you
do it. I don't own any brand of SmartPhone, and cannot do any sort
of test here for this. And bodging a test via other methods (VMs,
emulators) would totally invalidate the testing, and only tell you
how an emulator behaved.
Paul