exchange is blocking attached excel documents

When a email is set it looks like exchange is blocking the attached excel doc and replacing it with a txt doc with this message


The original contents of this file have been replaced with
this message because of its characteristics.
File name: 'Report_from_KALEIDOSCOPE_LIMITED.xls'
Virus name: 'UnwritableCompressedFile'
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Before sending, change the file extension or zip.  
If you are using ForeFront as your Antivirus Solution, please upgrade it to the latest Service Pack (This goes for all AntiVirus Providers avtually)
Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
This is not exchange...this is some other appliance or software in front of your mail server..I would look at the settings there.   I have seen antispam/antivirus soltutions strip password protected or encrypted (unscannable) attachements.   Look at those settings.

What do you have in front of exchange?  or on Exchange if ForeFront....

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