Regtool can't set default value?

[David Dyer-Bennet]

I'm not sure I'm understanding this right.  I'm trying to duplicate a 
manual setup that works (for making text files in general have an edit 
right-click option that invokes emacsclientw).

In that manual setup, (sorry, using cygwin path notation while referring 
to regedit, of course in regedit the path shows in Windows notation) 
I've set up /root/txtfile/shell/edit/command with a value named 
"(Default)" of type REG_EXPAND_SQ whose data is a (windows-style of 
course) path to emacsclientw.exe (plus some switches plus "%1" for the 
file name at the end).  That works -- the right-click menu for a file 
known to Windows as a txtfile (like foo.txt) has an "edit" entry, which 
when clicked invokes emacsclientw.

I'm trying to create this in a script using cygwin regtool.  I can 
create a key of /root/txtfile/shell/edit with a value of command having 
the right data -- but that of course does not work.  I can create a key 
of /root/txtfile/shell/edit/command with *two* values named (Default), 
the second of which is my value -- but that also does not work.  (And I 
can't delete the first value (Default) even in regedit.)

I clearly don't understand something about the data that Regedit 
displays under the name (Default), and how to create, delete, get, and 
set value to it.

How do I create this simple scenario using regtool?  (It's not actually 
emacs-specific, if you look at the default Windows registry for 
/root/txtfile/shell/open/command you'll find a value named "(Default)" 
of type REG_EXPAND_SZ giving a path to notepad.exe.  If I wanted to 
produce that using regtool, how would I do that?)

(If there's no way to do it with regtool, that's weird, and in 
particular a huge deficit in regtool since configuring preferred 
handling of various file-types seems like one of the things you'd really 
want to be able to do.

(It *ought* to be possible for my script to write a .reg file that it 
then feeds to regedit as an alternative way to do it, and if I can't 
make regtool work I'll try that, but I don't need suggestions about 
that, at least not yet -- I know how to do that, but am currently trying 
to understand regtool, and will only give up if we determine fairly 
authoritatively that regtool can't do what I need.)
-- 
David Dyer-Bennet, dd-b@dd-b.net; http://dd-b.net/
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