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Symptoms

When you use the AT command to schedule tasks on a computer that is running Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2, you experience one of the following issues.

Issue 1

When you schedule a single execution task by using the ATcommand, the task is not deleted after the task is executed. Specifically, you cannot find the task by using the AT command, but the task is listed in the Task Scheduler snap-in.at

Issue 2

Assume that you schedule a single execution task that runs at a scheduled time or date by using the ATcommand. In this situation, the task is not deleted after the task is executed, and the task runs weekly.

Notes

  • On a computer that is running a version of Windows that is earlier than Windows Vista and Windows Server 2008, task information is stored in a .job file.

  • On a computer that is running Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2, task information is stored in an .xml file. Additionally, when you schedule a task by using the ATcommand, a .job file is created for compatibility.

These issues occur because the schema in the .job file does not have the "End boundary" and "Delete task as soon as its finished" nodes. When Schedsvc.dll registers a task by using the ATcommand, the Task Scheduler Compatibility plugin creates the .xml file that stores the task definition. However, the Task Scheduler schema v1.0 that Task Scheduler uses to create the .job file does not have the "End boundary" and "Delete task as soon as its finished" nodes. Therefore, the issues that are described in the "Symptoms" section occur.

Resolution

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows Vista Service Pack 2 (SP2)

  • Windows Server 2008 Service Pack 2 (SP2)

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849How to obtain the latest service pack for Windows Server 2008

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information notesImportant Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Vista and for Windows Server 2008" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.0.6002.22990

9,728

30-Nov-2012

01:28

x86

Taskcomp.dll

6.0.6002.22990

270,848

30-Nov-2012

02:54

x86

Taskschd.dll

6.0.6002.22990

352,768

30-Nov-2012

02:54

x86

Taskeng.exe

6.0.6002.22990

171,520

30-Nov-2012

01:28

x86

Taskeng.mof

Not applicable

2,254

09-Sep-2011

11:42

Not applicable

Schedsvc.dll

6.0.6002.22990

602,624

30-Nov-2012

02:54

x86

Schedsvc.mof

Not applicable

2,250

09-Sep-2011

11:42

Not applicable

Wmicmiplugin.dll

6.0.6002.22990

346,112

30-Nov-2012

02:54

x86

For all supported x64-based versions of Windows Vista and of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.0.6002.22990

10,240

30-Nov-2012

02:00

x64

Taskcomp.dll

6.0.6002.22990

410,624

30-Nov-2012

03:35

x64

Taskschd.dll

6.0.6002.22990

656,384

30-Nov-2012

03:35

x64

Taskeng.exe

6.0.6002.22990

268,800

30-Nov-2012

02:01

x64

Taskeng.mof

Not applicable

2,254

15-Nov-2011

15:19

Not applicable

Schedsvc.dll

6.0.6002.22990

857,088

30-Nov-2012

03:35

x64

Schedsvc.mof

Not applicable

2,250

15-Nov-2011

15:19

Not applicable

Wmicmiplugin.dll

6.0.6002.22990

500,736

30-Nov-2012

03:36

x64

Schedsvc.mof

Not applicable

2,250

09-Sep-2011

11:42

Not applicable

Taskcomp.dll

6.0.6002.22990

270,848

30-Nov-2012

02:54

x86

Taskschd.dll

6.0.6002.22990

352,768

30-Nov-2012

02:54

x86

Taskeng.exe

6.0.6002.22990

171,520

30-Nov-2012

01:28

x86

Taskeng.mof

Not applicable

2,254

09-Sep-2011

11:42

Not applicable

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.0.6002.22990

20,480

30-Nov-2012

01:07

IA-64

Taskcomp.dll

6.0.6002.22990

807,936

30-Nov-2012

02:19

IA-64

Taskschd.dll

6.0.6002.22990

1,257,984

30-Nov-2012

02:19

IA-64

Taskeng.exe

6.0.6002.22990

523,264

30-Nov-2012

01:08

IA-64

Taskeng.mof

Not applicable

2,254

15-Mar-2011

06:01

Not applicable

Schedsvc.dll

6.0.6002.22990

1,418,240

30-Nov-2012

02:18

IA-64

Schedsvc.mof

Not applicable

2,250

15-Mar-2011

06:01

Not applicable

Wmicmiplugin.dll

6.0.6002.22990

986,624

30-Nov-2012

02:19

IA-64

Schedsvc.mof

Not applicable

2,250

09-Sep-2011

11:42

Not applicable

Taskcomp.dll

6.0.6002.22990

270,848

30-Nov-2012

02:54

x86

Taskschd.dll

6.0.6002.22990

352,768

30-Nov-2012

02:54

x86

Taskeng.exe

6.0.6002.22990

171,520

30-Nov-2012

01:28

x86

Taskeng.mof

Not applicable

2,254

09-Sep-2011

11:42

Not applicable

Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.21xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.1.7600.21386

9,728

30-Nov-2012

03:04

x86

Taskcomp.dll

6.1.7600.21386

304,640

30-Nov-2012

04:51

x86

Taskcomp.dll

6.1.7601.22177

305,152

30-Nov-2012

05:04

x86

Taskschd.dll

6.1.7600.21386

505,856

30-Nov-2012

04:51

x86

Taskschd.dll

6.1.7601.22177

506,880

30-Nov-2012

05:04

x86

Taskeng.exe

6.1.7600.21386

192,000

30-Nov-2012

03:04

x86

Taskeng.exe

6.1.7601.22177

192,512

30-Nov-2012

04:59

x86

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

22-Jul-2009

23:21

Not applicable

Schedsvc.dll

6.1.7600.21386

749,056

30-Nov-2012

04:50

x86

Schedsvc.mof

Not applicable

2,684

22-Jul-2009

23:21

Not applicable

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

10-Jun-2009

21:37

Not applicable

Schedsvc.dll

6.1.7601.22177

751,104

30-Nov-2012

05:04

x86

Schedsvc.mof

Not applicable

2,684

10-Jun-2009

21:37

Not applicable

Wmicmiplugin.dll

6.1.7600.21386

351,232

30-Nov-2012

04:51

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.1.7600.21386

10,240

30-Nov-2012

03:39

x64

Taskcomp.dll

6.1.7600.21386

473,600

30-Nov-2012

05:43

x64

Taskcomp.dll

6.1.7601.22177

474,112

30-Nov-2012

05:55

x64

Taskschd.dll

6.1.7600.21386

1,198,080

30-Nov-2012

05:43

x64

Taskschd.dll

6.1.7601.22177

1,198,080

30-Nov-2012

05:55

x64

Taskeng.exe

6.1.7600.21386

464,384

30-Nov-2012

03:40

x64

Taskeng.exe

6.1.7601.22177

465,408

30-Nov-2012

05:50

x64

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

22-Jul-2009

23:34

Not applicable

Schedsvc.dll

6.1.7600.21386

1,114,624

30-Nov-2012

05:42

x64

Schedsvc.mof

Not applicable

2,684

22-Jul-2009

23:34

Not applicable

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

10-Jun-2009

20:57

Not applicable

Schedsvc.dll

6.1.7601.22177

1,110,528

30-Nov-2012

05:55

x64

Schedsvc.mof

Not applicable

2,684

10-Jun-2009

20:57

Not applicable

Wmicmiplugin.dll

6.1.7600.21386

525,312

30-Nov-2012

05:43

x64

Schedsvc.mof

Not applicable

2,684

22-Jul-2009

23:21

Not applicable

Schedsvc.mof

Not applicable

2,684

13-Nov-2010

00:00

Not applicable

Taskcomp.dll

6.1.7600.21386

304,640

30-Nov-2012

04:51

x86

Taskcomp.dll

6.1.7601.22177

305,152

30-Nov-2012

05:04

x86

Taskschd.dll

6.1.7600.21386

505,856

30-Nov-2012

04:51

x86

Taskschd.dll

6.1.7601.22177

506,880

30-Nov-2012

05:04

x86

Taskeng.exe

6.1.7600.21386

192,000

30-Nov-2012

03:04

x86

Taskeng.exe

6.1.7601.22177

192,512

30-Nov-2012

04:59

x86

Wmicmiplugin.dll

6.1.7600.21386

351,232

30-Nov-2012

04:51

x86

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Hashcleanup.exe

6.1.7600.21386

19,968

30-Nov-2012

02:58

IA-64

Taskcomp.dll

6.1.7600.21386

873,472

30-Nov-2012

04:42

IA-64

Taskcomp.dll

6.1.7601.22177

873,984

30-Nov-2012

04:52

IA-64

Taskschd.dll

6.1.7600.21386

1,416,192

30-Nov-2012

04:42

IA-64

Taskschd.dll

6.1.7601.22177

1,417,728

30-Nov-2012

04:52

IA-64

Taskeng.exe

6.1.7600.21386

865,280

30-Nov-2012

03:00

IA-64

Taskeng.exe

6.1.7601.22177

866,304

30-Nov-2012

04:45

IA-64

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

23-Jul-2009

00:05

Not applicable

Schedsvc.dll

6.1.7600.21386

1,775,104

30-Nov-2012

04:40

IA-64

Schedsvc.mof

Not applicable

2,684

23-Jul-2009

00:05

Not applicable

D61d61c8-d73a-4eee-8cdd-f6f9786b7124.xml

Not applicable

3,188

10-Jun-2009

21:02

Not applicable

Schedsvc.dll

6.1.7601.22177

1,775,616

30-Nov-2012

04:51

IA-64

Schedsvc.mof

Not applicable

2,684

10-Jun-2009

21:02

Not applicable

Wmicmiplugin.dll

6.1.7600.21386

939,520

30-Nov-2012

04:43

IA-64

Schedsvc.mof

Not applicable

2,684

22-Jul-2009

23:21

Not applicable

Schedsvc.mof

Not applicable

2,684

13-Nov-2010

00:00

Not applicable

Taskcomp.dll

6.1.7600.21386

304,640

30-Nov-2012

04:51

x86

Taskcomp.dll

6.1.7601.22177

305,152

30-Nov-2012

05:04

x86

Taskschd.dll

6.1.7600.21386

505,856

30-Nov-2012

04:51

x86

Taskschd.dll

6.1.7601.22177

506,880

30-Nov-2012

05:04

x86

Taskeng.exe

6.1.7600.21386

192,000

30-Nov-2012

03:04

x86

Taskeng.exe

6.1.7601.22177

192,512

30-Nov-2012

04:59

x86


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

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