When you restore on 'custom' location a new master folder is created for your photo library. It will contain a copy of your pictures original folder tree plus a restored catalog folder as you have found. You also have found the 'default' location for catalogs accessible to all users: hidden folders in the C:drive by using the Windows explorer. During the process, the photo library tree and the pse6 catalog (database catalog.pse6db) are restored as explained above; then, when you agree to the conversion, the pse6 catalog folder is renamed with a -1 suffix, and a new catalog folder in the pse13 format is created with the old catalog name; it contains a 'catalog.pse13db' database file. The renamed pse6 catalog is still available for users having still pse6 on the new computer. The new pse13 catalog folder is available to you in the 'custom' location bottom section of the catalog manager. The pse6 and pse13 catalogs can only be opened from the corresponding pse version. - if you did not agree to the conversion at the end of the process, you only have a restored pse6 format catalog; a new empty catalog named 'catalog.pse13db is created, otherwise the organizer could not open. From this empty catalog, you can still stard the conversion by browsing to the new 'custom' location of the restored pse6 catalog. You are in the same situation as above, except you have an empty 'catalog.pse13db' as well as the converted catalog. You can delete it. As mentioned above, the organizer can't work without opening a valid catalog of the right version. It's useful to know that in such cases of corrupted catalogs, you can use the shift key to launch the organizer with a choice of creating a new catalog or repairing the old one. It's also important (and not obvious) that to move or delete a catalog, you should have another catalog opened, even an empty one. In your screenshot, the 'Move' (or 'Delete') button will only work if another catalog, even empty, is highlighted. If a single file is shown, you may have to create an empty one before moving or deleting. In your case, you could probably find an empty one in the all users section above, highlight it to activate it, then go to the custom location to highlight the file to be moved and the 'Move' button would be available. Now, what can you do with catalogs when the organizer is closed? - you can find them from the explorer searching for files named 'catalog.pseXXdb'. Each folder containing such a file is a catalog. The default folder location for all users can be found in the organizer help menu, section 'System Information'; it's a hidden folder location; you should have the explorer set to show hidden folders. - If you double click on such a 'catalog.pseXXdb' file, the organizer should open with the corresponding pse version (if installed) and the selected catalog. - If you duplicate, copy or move the whole catalog folder, even on another drive, it will be 100% useable. It's a way to create a backup of the catalog only without the big photo library. - Since the catalog name is free and only gets -1 suffixes if converted, nothing tells you which pse version they are: you have to look at the database name to find it, or it's good to include the version in the catalog name if you have several pse versions active.
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