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What does the "autocheck" in the default data of the registry value HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\bootexecute (Data is: autocheck autochk *) do? There's no autocheck.exe on a current (checked XP, Win7, Vista) standard Windows install, so it can't be launching an executable(?) I know what autochk does.

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4 Answers 4

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It's an arbitrary name associated with the boot-time command autochk *.

The BootExecute value is a REG_MULTI_SZ, i.e., it can contain multiple separate strings. However, if you double-click it in the Registry Editor you will notice that the default value is not three separate strings, autocheck, autochk and * but rather a single string autocheck autochk *.

Each string in BootExecute contains an arbitrary descriptive name followed by the command to execute.

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Thanks! That makes sense and it seems to work as explained in my tests too. :) –  myname Jul 24 '12 at 14:47
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From here. "autocheck" tells windows to run "autochk *" after previous illegal shutdown :)

By default, its value is "autocheck autochk *" - this tells Windows to run Autochk on any drive whose dirty bit is set

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Autochk is standard Windows native application. AFAIK, is always present in fresh install of Windows XP.

Explain from Microsoft:

The Autochk (Autochk.exe) utility is a version of Chkdsk. For more information about Autochk, see the Windows XP Professional Resource Kit. To do this, visit the following Microsoft Web site: Troubleshooting Disks and File Systems

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Yes, that's why I'm asking about autocheck, not autochk. ;) –  myname Jul 22 '12 at 12:40
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Imho, this runs some internal system checks. For example, when there is a folder C:\Program\, windows warn about it (because it interfere with C:\Program Files\).

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Not sure I understand. I just tried to create a C:\program folder and didn't get a warning on my XP. Is this internal warnings for the OS, not the user? –  myname Jul 22 '12 at 10:18
    
Was seen this warning (dialog box, suggesting to rename folder to Program1) in Windows 7. And this warning appears sometimes after booting. –  Maximus Jul 22 '12 at 10:23
    
Thanks! I hadn't rebooted, I see what you mean now. :) This message still appears though, when you remove autocheck from the bootexecute value. –  myname Jul 22 '12 at 10:28
    
Can you check, what process shows this warning? I was lazy to do that. May be "default value" is informational for user only, and OS runs checks everytime? :) –  Maximus Jul 22 '12 at 10:34
    
The popup is from explorer.exe and a procmon log shows explorer first accessing C:\program and then testing if c:\program1 exists. explorer was launched by userinit. –  myname Jul 22 '12 at 10:45
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