"Neither solution works for me, copying to the root or an "unopened" folder results in the same thing, a long wait, followed by bitter failure. Ima thinking there's a bug somewhere."
After buying the new Galaxy Nexus, friends to find there are problem to transfer files to Galaxy Nexus from PC: fail to transfer or transfer files via USB is too slow. Then you can use Tapatalk send from Galaxy Nexus or Dropbox(free, and web browser/desktop interfaces. You could just use the app to upload your file to their server, then install the app on the new device and download it. I've used it many times without incident. Yes you can delete the file after ward.) from Android Market, and Tapatalk is recommended by more users.
So after you are able to transfer files to Galaxy Nexus, then you may try to transfer a video file to Galaxy Nexus, take MKV files as example:
"The galaxy nexus won't transfer mkv video files.
When I drag the mkv file in, my computer says "Windows explorer has stopped working".
I have tried putting other types of video files (avi, mp4, etc...), they dont have any problems except for the mkv files." from galaxynexusforum
"Windows explorer has stopped working" problem comes from MKV file is the movies not supported by Galaxy Nexus, here advice you to use powerful MKV to Galaxy Nexus Converter to convert MKV to Galaxy Nexus MP4, WMV quickly and accurately, as well as convert AVI, MOV, FLV, RMVB, Divx, Xvid, M4V, MTS, M2TS to Galaxy Nexus MP4, WMV.
Meanwhile, this MKV to Galaxy Nexus Video Converter provides many features to help you edit, trim,cut, split, merge your video clips, and allows you to adjust video and audio parameters like bit rate, etc.
Click "Add File" Import MKV files to Galaxy Nexus Converter Mac from your PC HD drive.
Set Samsung Galaxy Nexus supported formats as output.
Or "Common Video"-----MP4
Go to "HD Video"-----HD Mp4.
You can also choose WMV or HD WMV.
Hit "Start" button to begin MKV to Galaxy Nexus Conversion.After conversion you are able to play MKV movies on Galaxy Nexus freely.
Tips: This Galaxy Nexus Video Converter is also a superb video editor, you can use it to trim, crop, merge videos and set effects like Brightness, Contrast and Saturation.