Description of problem:
libguestfs command os-inspect failed against Win7 64bit, nothing returned.


Version-Release number of selected component (if applicable):
libosinfo-0.2.7-10.el7.x86_64


How reproducible:
100%


Steps to Reproduce:
# guestfish -a en_windows_7_ultimate_with_sp1_x64_dvd_u_677332.iso

Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell

><fs> run
><fs> inspect-os 
><fs> 
><fs> quit

[root@rhel7libguestfs iso]# isoinfo -d -i en_windows_7_ultimate_with_sp1_x64_dvd_u_677332.iso
CD-ROM is in ISO 9660 format
System id: 
Volume id: GSP1RMCULXFRER_EN_DVD
Volume set id: GSP1RMCULXFRER_EN_DVD
Publisher id: MICROSOFT CORPORATION
Data preparer id: MICROSOFT CORPORATION, ONE MICROSOFT WAY, REDMOND WA 98052, (425) 882-8080
Application id: CDIMAGE 2.54 (01/01/2005 TM)
Copyright File id: 
Abstract File id: 
Bibliographic File id: 
Volume set size is: 1
Volume set sequence number is: 1
Logical block size is: 2048
Volume size is: 1621535
El Torito VD version 1 found, boot catalog is in sector 22
NO Joliet present
NO Rock Ridge present
Eltorito validation header:
    Hid 1
    Arch 0 (x86)
    ID 'Microsoft Corporation'
    Key 55 AA
    Eltorito defaultboot header:
        Bootid 88 (bootable)
        Boot media 0 (No Emulation Boot)
        Load segment 0
        Sys type 0
        Nsect 8
        Bootoff 2DE 734


Actual results:
no output


Expected results:
list of operating systems should be listed.

Additional info: