Where is the code responsible for running Exec parameter in *.desktop files, GNOME 2.32

I want to make a modification to the *.desktop file execution for myself. I
have a custom tag in the *.desktop files (beginning with X-, as advised by
the XDG specification), and I want GNOME to execute a certain command before
it starts the program specified by the Exec tag. The thing specified by my
custom tag in the *.desktop files will be the parameter of this command.
After some research, I found that gnome-menus is responsible for reading
*.desktop files, but I don't think that will be useful to me. I need to know
where is the code for executing the program itself. I came to the conclusion
that this part must be in gvfs or gnome-vfs, but I didn't find anything
there, either.

Let me give an example:
foobar.desktop
Exec=foobar
X-custom-tag=barfoo

Gnome should run "command barfoo" and then "foobar".

What's the simplest way to implement that?
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