id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7506	unique_path Fails on Windows for Temporary User Profiles	steve@…	Beman Dawes	"boost::filesystem::unique_path is failing on Windows if the user has a temporary (read-only) profile (e.g. guest account).
I have tracked the problem down to a failure in 
libs/filesystem/src/unique_path.cpp when it calls CryptAcquireContextW.

CryptAcquireContextW is failing with the arguments used. It appears that this is by design, for read-only profiles. See 
[http://blogs.msdn.com/b/alejacma/archive/2007/10/23/rsacryptoserviceprovider-fails-when-used-with-mandatory-profiles.aspx] for some background information.

I have modified the dwFlags argument of both calls to CryptAcquireContextW, adding CRYPT_VERIFYCONTEXT | CRYPT_SILENT and it is now working for me. 
I'm no expert on the Win32 crypto API so I'm not sure if this is a valid solution in all contexts."	Bugs	closed	To Be Determined	filesystem	Boost 1.51.0	Problem	fixed