hawkes wrote:Ok, thanks. Well, I have to admit that I'm still stumped. Guess I'll have to live with tabs on the bottom.

I admit that I probably gave you more info than you need to know to simply get the tabs_on_top feature working the way you want let's not give up so easily...
2nd try at expanation - When you open the key:
HKEY_CURRENT_USER\Software\ZabraKatranemia\xplorer2_UC\MainFrame Settings
and d-click on the variable
binDualPaneFlags
you will be able to change its value to whatever you want.
If it is currently=11 in decimal, then adding 256 will make
the value you want to set = 267
Be sure to have the number base display set to "decimal".
(I presume you will be doing this using
regedit.)
For me it's easier to do it in hexadecimal number base:
in which case, I would just change the value from "b" to "10b",
which adds "100"(hex) which is the same as 256 base10.
In either case,
be sure that you have NO instances of x2 running when you make the registry tweak; or x2 will not 'see' the change you make and will overwrite the variable with it's current setting when it closes.
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PS: All of the above may be found by carefully reading the file registry.txt