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In Finder the file VirtualBox_Uninstall.tool is greyed out.

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I want to delete this file, but I'm prompted by a message that the file is currently in use:

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Currently, I have no clue what is the cause of this. Therefore I want to know what other application is using it. How do I find this out?

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up vote 2 down vote accepted

The cause is usually a copy job that unexpectedly died or some process that has an open file handle on that file. You can check which process opened which files with lsof | grep "filename". This will not necessarily yield a result. If the issue isn't resolved after a logout or even a restart you still can continue at that dialog and remove the file.

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Very awesome! :) Thank you. – gentmatt Dec 13 '12 at 13:03

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