.PMP is a format proprietory to Picasa, used to store informations about images.
( Reference )
( Note: Below referenced blog post is dated, not sure how relevant/correct it is to the current version of Picasa )
More info:
in the db2 directory there are a
number of files. The important files
for this are albumdata_token.pmp,
albumdata_uid.pmp and
albumdata_name.pmp
Here are the contents of the files:
albumdata_name.pmp -
this is the name of the albums in
picasa. The first two
are defaults and are not included in
any of the other files.
Starred Photos
Screensaver
root
modified_for_tags
sam3
Sample Pictures
Sammy
albumdata_uid.pmp - This is where the
hashes are.
b131d7e17dfdff73eb0340b4e9d3d6f3
8e92a45a6abed421488a5774ec3f4a4c
ca05c73419475ade037f8df528849c91
ec9771e026e3ce55c468354abcfce4ee
c332f1814ff6d4f21dbb41b41149544d
albumdata_token.pmp
Here's we see
the uid applied to create a token for
the albums. Note that "star" and
"screensaver" do not have uids.
]star
]screensaver
]album:b131d7e17dfdff73eb0340b4e9d3d6f3
]album:8e92a45a6abed421488a5774ec3f4a4c
]album:ca05c73419475ade037f8df528849c91
]album:ec9771e026e3ce55c468354abcfce4ee
]album:c332f1814ff6d4f21dbb41b41149544d
Now, if we look at the
lastalbumselected value in the
registry, we can pair it up to the
hash since these files are all listed
in the same order. If you exclude star
and screensaver you can see that the
lastalbumselected for me was sam3.
You can even go one step further if
you include albumdata_filename.pmp.
This file also matches up to the other
files, except I forgot to mention one
thing. "root" is literally the root of
the logical drive that picasa
searched(in this case C:), so it is
excluded from albumdata_filename.pmp.
This file contains the path to where
the images are stored.
Other files to pay attention to:
bigthumbs.db
thumbs2.db
thumbs.db
previews.db
These all follow the good old
thumbs.db structure and contain
thumbnails of all of the images at
various resolutions, since picasa can
send files directly to photo
processing businesses.
One other thing that is of pretty
vital importance in terms of proving
that someone created an album and that
the program didn't just index
something.
In the Picasa2Albums directory you'll
see a file for each of the album(s)
created by the user under the folder
using the DBID as its name. Below are
the contents of the album I created
stored in a file named
{c332f1814ff6d4f21dbb41b41149544d.pal.
'picasa2album>
'dbid>0164eaeacdd4046f5c1e44522fe44527
'albumid>c332f1814ff6d4f21dbb41b41149544d
'property name="uid" type="string" value="c332f1814ff6d4f21dbb41b41149544d">
'property name="category" type="num" value="0">
'property name="date" type="real64" value="39272.630035"
'property name="token" type="string" value="]album:c332f1814ff6d4f21dbb41b41149544d"
'property name="name" type="string" value="Sammy"
'files>
'filename>[C]\sam3\sam1.jpg
'filename>[C]\sam3\sam3.jpg
'filename>[C]\sam3\sam2.jpg
'filename>[C]\sam3\DSCF1890.JPG
'/files>
'/property>
'/picasa2album>
