Photoshop CS5: how many files can be opened at once?

I've just tried to open about 400 jpg's in Photoshop CS5, as I needed to crop them to the best ratio for display on my iPod Touch, and I got an error message saying I'd tried to open too many images at once, and it stopped at about 200.
My system is a Win7 Pro 64Bit, 3.4GHz i7 machine, with 16GB RAM, and I thought actions like this were driven by the amount of system resource available, but Photoshop seems to have an internal limit, regardless of the resources.
Has anyone else come across this apparent limit, and is there a way 'round it?
Thanks
Paul

In that case if a center crop will do you can download my crafting actions package. It contains a plug-in script that I wrote based on Adobe plug-in script Fit Image its name is AspectRatioSelection you can record using it in an action set its dialog to have it set a new selection that is a rectangle with a aspect ratio 3 2 that is centered and not feathered. This script will select a 3;2 center selection for lanscape images and a 2:3 selection for Portrait images. When the action is played the diaqlog will not show for the plug-in will record the settings you used when you recorded the action into the actions step. These setting will be passed to the script when the action is played and the script will not display its dialog unless you turn on the dialog in the action step. Once this setp is recorded follow it with a Image Crop step. Once you have recorded this two setp action you can run the Image processor set its dialog to run this action and heve it save and resize the crop to fit 1920x1920 or you could include a Fit Image step in the action after the Image crop step and set the Fit Image dialog width and height to 1920. You will find Fit image and AspectRatioSelection under menu File>Automate>...... You will also find Imahe Processor Pro there if you download it from Russell Browns web site.
If a center crop will not do for you add an additional step to the action to make it interactive by adding an interactive transform selection after the aspectratioselection step. The step need to be recorded with a 180 degree rotation and have its dialog turned on and you will need to hold the shift or shift+alt keys down and use a cornor point as you transform the 3:2 selection to constrain the selection to have the same 3:2 aspect ratio.
Crafting Actions Package Contains
Action Actions Palette Tips.txt
Action Creation Guidelines.txt
Action Dealing with Image Size.txt
Action Enhanced via Scripted Photoshop Functions.txt
CraftedActions.atn Sample Action set includes an example Watermarking action
Sample Actions.txt Photoshop CraftedActions set saved as a text file.
12 Scripts for actions
Download

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I found it:
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I created DB_CONFIG file, and add three lines:
set_lk_max_locks 20000
set_lk_max_lockers 20000
set_lk_max_objects 20000
As the default values are 1000 of each type of object, my applicaton open 499 database(except internal database) simultaneously(CDB modal) . After changed parameters, my application opend above 6000 database.

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