Microsoft KB Archive/924952

= Users may receive a text file that states that a file was deleted because of its &quot;Large uncompressed size characteristics&quot; after you configure Antigen =

Article ID: 924952

Article Last Modified on 10/9/2006

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APPLIES TO


 * Microsoft Antigen for Exchange
 * Microsoft Antigen for SMTP Gateways
 * Sybari Antigen 8.0 for Microsoft Exchange
 * Sybari Antigen 8.0 for SMTP Gateways

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
You install and configure Microsoft Antigen 9.0 or Sybari Antigen 8.0. After you do this, users in your organization may occasionally receive an e-mail message that has a text file attached. This text file contains the following information:

FILE DELETED The original contents of  have been replaced with this message because of its Large uncompressed size characteristics.

This issue occurs if the following conditions are true:
 * The Delete Corrupted Compressed Files check box is selected in the General Options work panel in Antigen. To view this setting, follow these steps:
 * Start the Antigen Administrator program.
 * In Shuttle Navigator, click General Options.
 * In the General Options work panel, notice the Delete Corrupted Compressed Files check box that appears under Scanning.
 * The affected user received an e-mail message that has the following characteristics:
 * The e-mail message contains an attachment.
 * The attachment is in a compressed format. For example, the attachment is compressed in a .zip archive.
 * The uncompressed size of the message attachment exceeds the value that Antigen is configured to allow for in compressed message attachments. By default, this value is 100 megabytes (MB).

Note When this issue occurs, an event that mentions &quot;Detected Corrupted Compressed file&quot; is logged in the %ProgramFiles%\ \Programlog.txt file.



RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

If you are severely affected by this issue, you can modify the uncompressed file size for compressed message attachments that Antigen allows for. This size is controlled by the following registry entry:

Value name: MaxUnCompressedFileSize

Value type: REG_DWORD

Value data: 100000000 (decimal) (This is the default setting.)

To modify this setting, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate the following registry subkey:

 In the right pane, right-click MaxUnCompressedFileSize, and then click Modify. In the Edit DWORD Value dialog box, click Decimal. Then, type the number that corresponds to the number of bytes to which you want to restrict the uncompressed file size of message attachments. By default, this value is set to 100000000. This corresponds to 100 MB.

For example, to restrict the uncompressed size of message attachments to less than 200 MB, type 200000000 in the Value data box. To restrict the uncompressed size of message attachments to less than 53 MB, type 53000000 in the Value data box.

Note In this registry entry, do not calculate the total number of MB by using a base value of 1024. Click OK, and then exit Registry Editor. Stop and then restart the AntigenService service. To do this, follow these steps: <ol style="list-style-type: lower-alpha;"> Click Start, click Run, type services.msc, and then click OK.</li> In the Services Microsoft Management Console (MMC) snap-in, right-click AntigenService, and then click Stop.</li> After the AntigenService service stops successfully, right-click AntigenService, and then click Start.</li></ol>

Note We recommend that you use the Stop command and the Start command instead of the Restart command to restart the AntigenService service.</li></ol>

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MORE INFORMATION
For more information about how to configure Microsoft Antigen, see the Microsoft Antigen for Exchange User Guide. To view this guide, visit the following Microsoft Web site:

http://www.microsoft.com/technet/antigen/2006/antigenforexchange/default.mspx

Additional query words: Spam

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