So you want to tweak something regarding the "wbar", and you found a .desktop file. Those particular files are actually not influencing the "wbar" (at least not until now). During the system boot these .desktop files are only used to populate the "SystemTools" sub-menu (which is visible via mouse right-click on the desktop when using the default WM 'flwm_topside').
The initial "wbar" is actually controlled by '/usr/share/wbar/dot.wbar', but the "current" config file is '/usr/local/tce.icons'. If you'd like to test a change use the latter file and force a re-start of "wbar" via
wbar.sh If you'd like to make permanent changes I'd suggest to do those in the former file. To allow for them to "survive" a re-boot the changed file needs to be included in the backup (e.g. via
echo usr/share/wbar/dot.wbar >> /opt/.filetool.lst). If you do this just make sure that you have a setup for persistency and have executed a backup (e.g. via
filetool.sh -b)
Triggered by your question I've actually done a bit of "poking around", and written another
post, which you might want to read. OTOH it might just confuse you, so that is up to you whether you see any benefit in the question I raised there.