slide/mono — comment on commit 407dd029e3f1ec712a7f6a8b684b8ee8d2a18b61
File:  line 0
By slide:

msbuild fails with the following if overwritereadonlyfiles is false and the target file exists and is readonly:

C:\Users\XXXX\project.msbuild(8,3): error MSB3021: Unable to copy file "
C:\Users\XXXX\Temp\Copy\copy.txt" to "c:\Users\XXXX\Temp\Target\copy.txt".
Access to the path 'c:\Users\XXXXX\Temp\Target\copy.txt' is denied.

The interesting thing is though, v4.0 msbuild says it doesn't support the OverwriteReadOnlyFiles, but it exists all over in Microsoft.Common.targets.