I stumbled upon this while running ProGen for the Utils project.
I was using a debug_static_mt build of ProGen.

Steps to repro:

• Build ProGen debug static_mt for x64
• Run ProGen for the Utils project

ProGen fails with: SAXParseException: Tag mismatch in 'D:\Dev\Github\poco\Util\Util_vs90.vcproj', line 597 column 5

I tracked down the error to this line https://github.com/pocoproject/poco/blob/master/XML/src/xmlparse.cpp#L3039

It seems that the parser is trying to match a <File> tag with the closing of a </Filter> tag.

But I have no idea how to fix this, :-(