Excuse my ignorance, but I'm hoping for some help in installing a patch to OS2008 to lock desktop applets, discussed in this thread.

In the patch "Binaries for people to try drag lock v2" from the bug page at https://bugs.maemo.org/show_bug.cgi?id=2639, there are three files with "-dev" in the name, three files with the same name except "-dbg", and three files with neither string. And one file with "-doc" in the name.

Which files do I install?

Can I install them just by opening the files in File Manager?

Is there a way to back up my system first, in case of problems?