How to limit the file types to be uploaded to KM folders?

We need to restrict files uploaded to KM to the following types: *.pdf, *.doc, *.ppt, and *.xls.  Uploading the other file types will need to give user an error message. 
1) Is there a configuration to satisfy this requirement?
2) If not, what is the work-around? How to we achive this goal?       
For example:
1. Go to u2018Private Documents and Discussionsu2019 hyper link.
2. Click on Owner.
3. Click on 'Send E-mail' hyperlink
4. Click on the 'Browse' button, selects a file (with .exe extension)
5. Click on 'Open' button and 'Upload' button (would like to give user an error message at this point)
Thank you so much for your help.  I have searched the forum but did not find any specific answers to this issue.

Hello,
I have the same problem, unfortunatelly there's no standard way to do this and developing
custom repository services or upload commands may not attend totally my requirements.
An idea is to create FSDB CM Repositories or to map external File System repositories for
specifics needs, so once the documents are stored into a file system (windows in my case)
it's simple to implement the organization's policy, be it file types, maximum folder size, clean-up routines, etc..
However there are pros and cons, some services are not available and there are some restrictions,
here's more detailed information: http://help.sap.com/saphelp_nw04/helpdata/en/62/468698a8e611d5993600508b6b8b11/frameset.htm
As for the original folders on DB mode, we've been running KM detailed reports once a week
and deleting the "illegal" files found
kind regards,
Rafael

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