cannot add new ant build file in 5646

See http://www.jetbrains.net/jira/browse/IDEA-8381

Thibaut wrote:

i Created a empty file named build.xml using Windows explorer.
It is located directly in the content root of a java module.

I get an error when trying to add it as ant build file using idea
"cannot add build files from excluded directories"

Attached a screenshot of the project


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thanks :)