Troubleshooting in Windows
But if for some reason, Windows fails to recognize the file by file extension or file structure, Windows may guess what the file is. If it finds a file named action.aqti, Windows Explorer will declare it an AQTI file! If it there's no file extension to latch onto, Windows may look inside the file or peer at other file attributes to determine what the file most likely is.
Who knows where it finds "containerX?" It may be from a system library that the program that created the file "linked against" when it was compiled (or created). It may be in some DLL ("data-link library") file on the PC or .NET (Microsoft dot-net) package, or even a built-in system call that Windows somehow related enough to think, "Aha! That is a . . . containerX file."
But the specifics, in this case, are not important. What is important is that the file has become too damaged to read or open.
Thus, the first thing to do is to try to open the original copy of the file in the original location. If it opens correctly, delete the containerX file and try the copy operation again. Often, copy problems that happen during batch copying, such as transferring from a camera to the PC or copying many files in one operation from one hard drive to another, do not occur when copying the files individually.
If you get the same result again, start your troubleshooting using an intermediary, if possible. Try copying the file to a USB flash drive first, and then to the PC. Do you get the same result?
If so, try opening the file from the flash drive, and try opening it on another PC, too.
And if the other PC has no problem, but the problem continues when you try to copy JPEG graphics on your PC, I would suspect that something has gone awry in Windows - some problem in the Registry really is convincing Windows that your JPEG files are "ContainerX" files, or some loose file extension identification exists on the PC, or possibly even another application is at fault.
But I'm guessing that trying the copy operation again will be the solution.