However, the file is not ‘.app’ format, there are multiple files and are in dmg format. These files cannot be used directly to install macOS sierra or to upgrade to macOS sierra. However, you can use these images to create a bootable USB drive and then install it on your mac or pc but the procedure is a bit tricky. Open DMG File. The usage of the DMG file extension is in the context of a mountable disk image file which is generated by the Mac OS X Operating System platform. Once the file is opened, the system will mount it in a virtual disk located on the user's desktop. I've been having trouble with my Mac since I installed Yosemite, where I open an.dmg file, and it would go to the Disk Utility, then I would have to open it from there. My MacBook running Yosemite did not do this, and would give the normal graphic to drag the file over applications to execute it.
Getting the following error when trying to create a High Sierra VM.The DMG does mount, but VirtualBox refuses to use it for a VM.
Failed to open the disk image file /Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg.
Could not open the medium '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg'.
VD: error VERR_VD_DMG_INVALID_HEADER opening image file '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg' (VERR_VD_DMG_INVALID_HEADER).
![Dmg file not opening mac sierra free Dmg file not opening mac sierra free](/uploads/1/2/6/0/126072261/797357610.png)
NS_ERROR_FAILURE (0x80004005)
Component:
MediumWrap
Interface:
IMedium {4afe423b-43e0-e9d0-82e8-ceb307940dda}
Dmg File Not Opening Mac Sierra 2016
Callee:IVirtualBox {0169423f-46b4-cde9-91af-1e9d5b6cd945}
Callee RC: