I have 7 Home Premium 64 Bit. I was in the registry and noticed something. Under HKEY_CLASSES_ROOT> I have Unknown and Unknown_BU. I was wondering if this is normal. I checked a 32 Bit version and it does not have a Unknown_BU. Maybe someone who has 64bit version could check theirs foe me? I think I'm having an issue with the "open with" dialog box.
I have HKEY_CLASSES_ROOT\Unknown but not Unknown_BU. Also HKEY_CLASSES_ROOT\Unknown\shell\openas\command\. This subkey is actually the action to open the "Open With" box for "unknown" files when windows can't find the suitable application to open a file with.
Backup your reg before playing in it.
I only have the unknown key:
For background:
Open with - Add Program
And this may fix your problem, the download in step #1 will reset your unknown key to default: Open with - Opening to Notepad or a Error Fix
Check the bottoms of both tutorials there may be another tutorial under Related Tutorials that may apply to your situation.
As to the unknown_bu, that looks like a backup to the unknown key. You've been getting any error or warning messages?
If you haven't done it recently: Registry - Backup and Restore
Thanks everyone. I don't actually get error messages always. The issue is when I try to open a file (PDF) received in yahoo mail, using Google Chrome, I do get an error and no way to get "open with". Sad thing is it works using IE and Firefox. You click download on the file and a dialog box opens at the bottom where you can "open", "save", or "cancel" in IE and in FF you get the "open with" dialog box. To make it worst, another PC (same model #) will give the option to "open with" using Google Chrome. I googled a little and found things pointing to the registry. Then I found the entries in the registry I referred to in the original post. Additionally, there have been numerous users over the past years on this particular PC including several small children.
I was thinking about doing a repair install to ensure the OS was good to go. I did an sfc /scannow and found no issues. I would really like to wipe this puppy and start all over but they have Office 2007 and MS has no download for it (I spoke with them). So, would a repair install hurt? Could the OS have some issues even though the scannow showed nothing?
It shouldn't, but read the top three boxes before you start: Repair InstallSo, would a repair install hurt?
We usually suggest to run the SFC scan at least three times with reboots in between to be sure, see the blue note box in option two: SFC /SCANNOW Command - System File CheckerCould the OS have some issues even though the scannow showed nothing?
You could also run a CHKDSK before you run those SFC scans.
Do you have an OS backup before you do the repair?
If youve used an optimizer program, one of the default options is to remove the open with link
Roy
Ran chkdsk. Also ran scannow 3x and all is good.
Not sure what you mean by OS backup. Can you elaborate?
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