No specific info about version 2.3. Please visit the main page of PSP ISO Shrink on Software Informer.
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PSP ISO Compressor is, well, an ISO compressor for the PSP.
CSO-DAX Compressor compresses ISO files with PSP format.
Shrink O’Matic is an AIR application to easily (batch) resize (shrink) images.
AnyToISO - Open/Extract/Convert to ISO, Extract ISO, Make ISO.