I want to do it because I want to install Windows 7 and my BIOS menu doesn't appear; it skips to grub2 menu at start, but that's another story... Is there a way to boot the Windows 7 installation iso directly from grub2?
Yeah, you'd think something like this would work:
But Windows will just balk at that.
If you happen to have at least 4GB RAM, you can opt to load the whole DVD iso in memdisk and boot off that. To do that, download SysLinux and extract the
However, I'm not going to even test the code, as putting 3+ GB of data into RAM is just plain wrong (from an idealogical standpoint). No, I really wanted what you want, but in the end I put the Windows install on a partition on a USB using the Windows 7 USB/DVD download tool and chainloaded to that. Sorry there doesn't seem to be any other way that I can see.
Technically installing from windows's .iso file can't be possible. You can boot from the .iso using grub but after that Windows will loss contanct with the mounted location or it is not capable of it. So both grub & Windows should aware of mount and boot. Currently Windows doesn't support.
So you neeed to extract/copy the content of .iso to root of a partition and then chainload into it using grub.