The Microsoft tool DISKEDIT.EXE is a low-level tool for directly reading and writing raw disk data. You ought to be able to load the cluster containing the directory entry for this file and just change the offending '?' character to something innocuous and write it back to disk.
It is my understanding that the Microsoft diskedit tool (not the Norton Utilities tool by the same name, which is only for FAT volumes) was last seen in Windows 2000 SP4. But there is a link to it that can be found here.
To locate the right cluster, you can download a trial version of DiskExplorer for NTFS.
You would start with File->Drive... to open the drive containing this bad file. Select Goto->Root Directory to get a directory view. Navigate to the directory containing your bad file by using the MFT# links. When you get there, the top of the window will say something like, "MFT# x12345 DIR: 'dirname', ...blah blah blah... starting at cluster x9302AE,... blah blah blah"
Now move over to Microsoft diskedit. First do File->Open... and specify Volume Name C: (if the file is on your C: drive). Leave the Volume File Name blank. Take that starting cluster number and enter it into diskedit under Read->NTFS Clusters...->Starting Cluster (enter it as a hex number).
Now use your arrow keys to scroll down to the bad filename. It's in unicode, so you'll be looking for something like "W.h.e.r.e. .H.a.v.e. .A.l.l. .t.h.e. .C.o.w.b.o.y.s. .G.o.n.e.?...o.g.g." Position your cursor over the bad "3F" character and type something safe, like 5F ('_'). Choose Write->It to write it back to disk.
There is another spot to hit (not sure if one or both are needed). Now, back in DiskExplorer, click on the Mft# for the bad file. You'll get a screen with a tree thing on the left that says "structures". Click on "Attributes" in the tree. It will show you a list of attributes, one of which will be something like $30 ... $FILE_NAME. So, $30 has the file name. Click on the Body node under the $30 node in the Structures tree. Select menu View->as Hex. Several lines down, you should see the filename again W.h.e.r.e. .H.a.v.e... etc. Over on the left side of the screen, you'll see the Sector column, which shows which disk sector you're looking at.
Back over the diskedit. Do Read->Sectors... and enter the sector number from DiskExplorer. As before, scroll down and replace the "3F" character with the same character as you did above. Choose Write->It to write it to disk.
I did all this, and the tools tell me that I've changed the character, but explorer doesn't. The directory must be cached somewhere. After a reboot, the change becomes visible.
