I found something about nopEX :
The Motorola A920/A925/A1000 are not able to run applications from the memory card. With nopEX you can!
Please note: Not all Symbian applications are designed to run from external memory. Some can be installed on the memory card and even then won't run correctly (example: AppickerConfig v1.0). In such cases, even nopEX can't help.
After installing nopEX, install your desired application as always. On the "where to install" prompt, select the external memory card (X. If there are two options with the same name, always select the second option!
You won't be prompted for applications that are not designed to run from external memory.
Sometimes, the icon for the new application does not appear automatically in the launcher - then restart your phone or remove the memory card, wait a few seconds, and insert it again. Still, restarting is always the preferred way, because removing the card when the phone is switched on might lead to broken data.
What if an application, let's name it FOO, is already installed in internal memory and you'd like to move it to the memory card? Two possibilities:
1) Uninstall FOO first and then install it again as described above. You might loose some of your settings or data when doing an uninstall.
2) Move FOO manually. You'll need a filemanager on your device (like qFileman) or a newer Desktop-Suite on your PC. Move directory C:\system\apps\FOO to X:\system\apps\ so you'll end up with directory X:\system\apps\FOO and that's it. Note the different drive! In case FOO won't work correctly afterwards, try possibility (1).
WARNING: You might notice a hidden directory "nopEX" on your memory card (D:\nopEX). Do NOT delete, modify or even touch this directory, it's an exact mirror (copy) of nopEX's drive X: and you need it. After uninstalling nopEX you can safely remove this directory, but that will also remove all applications which are installed on the memory card.