How to open/save heaps of PSDs-only with previews for LR?

Question

I have the following troublesome LR/PS scenario to deal with:
Many of my old PSD files were not saved with max. comp. previews, and thus refuse to import in LR (a very annoying "feature"!) Hence, I need to create an Action or Script in PS CS2 which will:
1. open ONLY my PSD files in all relevant folders and subfolders
2. i.e., it must ignore all DNG, NEF and JPG files
3. and it must save out the PSDs again without any alterations to embedded profiles (I have enabled the save-preview in the Prefs, which horribly bloats many of my already-huge PSD files)
It seems like a trivial problem, which a simple Action could solve -- but I am unable to make my Action open only PSD files, as the Open command wrecks the Action. Yes, I tried if the Image Processor could do this, too, but was unable to make that work as needed. I had the bizarre idea of using Lightroom to globally rename the extensions of all JPGs to, say, XXX, and the DNGs to YYY, etc, to make PS become temporarily oblivious to them -- but it appears that the Rename function in LR is quite unwilling to rename extensions and/or put any other characters after the extension.
Any bright ideas from you wise folks? :-)

Answer 1

actually now I have a problem with catching Save Dialog event...
here is my code:
final JFileChooser fc = new JFileChooser();
int returnVal = fc.showSaveDialog(ApplicationFrame.this);
try
System.out.println(returnVal + " return value ");
if (returnVal == javax.swing.JFileChooser.APPROVE_OPTION)
File file = fc.getSelectedFile();
FileOutputStream fos = new FileOutputStream (file.getName());
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(myCanvas.getItems());
out.close();
myCanvas.repaint();
catch(Exception ex)
ex.printStackTrace();
System.out.println("IO EXCEPTION :" + ex.getMessage());
when I run it I get 0 ... it means it doesn't catch click on SAVE button... what am I doing wrong ???