7-Zip: Opening image from 7z archive produces error code 0x8000000a

I've tried encrypting a folder containing a text file and an image with AES encryption using the .7z format. When I enter the password to open the encrypted folder the two files are displayed. I can click on the text file and it opens with my default text editor (although sometimes this is a bit slow). On the other hand when I try to open the JPG I get the following error. The default program associated with JPG files (I think it's called Windows Live Photo Collection or something similar) works fine when I try to open the same JPG from disk.

My aim is to be able to read my unencrypted files from memory after entering the archive's password, without extracting the files to disk, so that they may remain in memory where they can be kept safe from disk hacking (unlike hard disks, memory is automatically zeroed once the computer is turned off, hence the advantage).

Anyone know why I am getting the following error and how to get rid of it?

NOTE: This problem seems explicitly related to the 7-Zip application. When I carry out the same steps with PeaZip and open the JPG I don't get this error code. Anyone know why?