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Whenever I want to create a new text file using Windows 7 Explorer’s New ⇨ Text File context-menu entry, I get a file with an uppercase extension. For example instead of New Text Document.txt, I get New Text Document.TXT.
I searched HKEY_CLASSES_ROOT and found a key named .TXT. I renamed it to .txt and after rebooting, it works as expected. Unfortunately, after a while, it started happening again.
Torsten
Posted 2011-05-05T07:22:26.000
Reputation: 121
@Synetech It's been a while, but I think it was just the symptom. – Torsten – 2019-11-21T08:46:38.070
1You may use regmon or procmon tool from SysInternals family to find out which process is modifying this registry key, this will give you some clues to the reason of the problem. – Jack Shainsky – 2011-05-05T09:30:59.213
@Jack Shainsky Thanks. How do I use it? I set up a filter like this: Path contains HKEY_CLASSES_ROOT then Include. Will this be sufficient? – Torsten – 2011-05-06T12:54:59.293
regmon uses a shortcut for HKEY_CLASSES_ROOT, so you should set the filter for HKCR. I would set it for HKCR.txt for getting only the messages that you're interested in. – Jack Shainsky – 2011-05-08T10:28:53.480
I have this as well, do you happen to use Notepad++? – Brave Newbie – 2012-02-02T19:10:19.273
@Qosmo No, I don't have it installed and I think I didn't install it ever on the machine I'm having trouble with. – Torsten – 2012-02-08T12:29:26.030
You indicated that the problem returns after a while. Do you mean that
HKCR\.txtgets changed back toHKCR\.TXTor just the symptom (i.e., it is still\.txt, but new files have uppercase extensions)? Did you try monitor register writes? – Synetech – 2012-12-02T05:34:38.290