ADSIEdit suddenly stopped working, returning error "MMC cannot open the selected file"

Try creating a new MMC

Start, run
MMC
Click file, Add/Remove Snap-in
click Add
Select ADSIedit and then click ADD
Then click close, then OK

If that doesn't work try re-installing the windows support tools from the 2003 CD.

better option is to install w2k3 sp1 adminpak.

Strongline,

ADSIedit is part of support tools, not the adminpak

Strongline,

Sorry, I guess it's in the adminpak as well.  Used to be a support tool thing

Thanks for the idea. When I open mmc, I only get a 'Console' and 'Help' option in the menu bar, although I recall a 'File' menu going back a few years.  Incidentally, this particular server is win2K.  I just tried another server in our a.d. domain, a win2k3 server, and adsiedit opened ok.

I tried using 'Console', 'open' and located the adsiedit.msc file, but I still get the same error as in my original post.  I also cleared the windows event viewer, tried opening adsi again and got the error, and looked in event viewer to see if it spiked an error, but nothing appeared :(

I might have to try reinstalling support tools, but might you have another suggestion in the meantime?
Thanks!

Re-install the adminpak as per strongline's suggestion, it will be up to date as opposed to the date support tools:
http://www.microsoft.com/downloads/details.aspx?FamilyID=C16AE515-C8F4-47EF-A1E4-A8DCBACFF8E3&displaylang=en

Well, that links to a page for the adminpak for server 2K3.  I mentioned in my last post that this particular server is running Win2K.  Is there an equivalent for Win2K?