$ ls -l
total 299064
-rw-rw-r--. 1 gcecchi gcecchi     26424 Jan  6 09:00 Fedora-18-Final-RC1-x86_64-DVD_netinst.diso
-rw-rw-r--. 1 gcecchi gcecchi       152 Jan  6 09:01 Fedora-18-Final-TC4_RC1-x86_64-MD5SUM
-rw-rw-r--. 1 gcecchi gcecchi       248 Jan  3 17:55 Fedora-18-TC4-x86_64-CHECKSUM
-rw-rw-r--. 1 gcecchi gcecchi 306184192 Jan  3 20:44 Fedora-18-TC4-x86_64-netinst.iso


$ cat Fedora-18-Final-TC4_RC1-x86_64-MD5SUM
3d0a1b32c7a1766624cefd821787bbd5 *Fedora-18-Final-RC1-x86_64-DVD_netinst.diso
...

$ md5sum Fedora-18-Final-RC1-x86_64-DVD_netinst.diso
3d0a1b32c7a1766624cefd821787bbd5  Fedora-18-Final-RC1-x86_64-DVD_netinst.diso

$ applydeltaiso Fedora-18-TC4-x86_64-netinst.iso Fedora-18-Final-RC1-x86_64-DVD_netinst.diso Fedora-18-x86_64-netinst.iso
reading 470098036 bytes from old iso...fread: Success

no image produced...

Any hint?

Gianluca