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

FILE QUARANTINED

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'
mfriederAsked:
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carsRSTCommented:
Before sending, change the file extension or zip.  
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KyoshCommented:
If you are using ForeFront as your Antivirus Solution, please upgrade it to the latest Service Pack (This goes for all AntiVirus Providers avtually)
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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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