They are linked to quickexec, which helps to speed up the start time of a program by keeping all the common code in memory and when needed, the rest of the application is dynamically loaded from a library.
The application libraries are in /home/QtPalmtop/binlib , but these are only links to the real files in the ROM.
All the preinstalled applications are in the ROM, which is normally read-only. So you are not going to gain any internal storage by getting rid of these applications because they're not in internal storage.
There is a way to make the ROM partition writable so you could delete the applications and move some other applications in that you will always want, although it is easy to mess up your ROM image this way. Resizing the ROM partition, if possible, requires a fair bit of knowledge, a new kernel and probably a new ROM image.