VHDX file format is a virtual disk image file, new version of the VHD format. It is a format supported by Windows 8 and Windows Server 8 operating systems.
VHD is a file which contains a virtual image of a hard drive , used by Microsoft Windows Virtual PC. Single VHD file may contain all data stored on a physical hard drive, saved exactly in the same structure – partitions, system files, regular files and folders.
After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the VHDX file after converting to VHD may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from VHDX to VHD to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting VHDX to VHD does not meet your expectations, you can simply try to find on the Internet a different version of your file in VHDX format, properly converted to a VHD file by someone else. If this fails, use the information provided in the further part of the website.
Unfortunately, if after performing the two previously described steps (trying to find your VHDX file converted by someone else, and the attempt to convert it to VHD on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the VHDX file in its original format (without conversion to VHD file). Such a solution will be difficult to implement, but it certainly will give the best result.