Description of problem:
My WebMail system installed into FC5 server don't recongnized correctly
the attached files with the .dwg extensions. The files are recognized as  
text/plain and this does with that the file be corrupted.
I send this information to webmail developers and the answer was:
Note: 
I quizzed with different browsers and the result is always the even.  Then the
browser is not the problem.

-----------------------------------------------------------------------
 Ticket             | 4973
 Updated By         | Jan Schneider <jan>
 Summary            | ACAD files they are recognized as plain text
 Queue              | IMP
 Version            | 4.1.3
 Type               | Bug
-State              | Unconfirmed
+State              | Not A Bug
-Priority           | 3. High
+Priority           | 1. Low
 Owners             |
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Jan Schneider <jan> (2007-02-05 12:58) wrote:

The browser and/or the mime magic detection on your server is responsible
for setting the correct mime type.

Version-Release number of selected component (if applicable):


How reproducible:


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Expected results:


Additional info: