Why did visual studio 2010 stop compiling files with an apostrophe in their filename?

Why did visual studio 2010 stop compiling files with an apostrophe in their filename?

We have a few files in one of our Visual Studio projects that contain an apostrophe in their filenames.

We have been compiling those using Visual Studio 2010 projects for 12 years, at least 2 years using VS 2010. The last successful build was done on March 15, 2012.

Now Visual Studio is ignoring the custom build rule altogether for those files, as if they had been marked to exclude from build, which is NOT the case.

I tried inserting an apostrophe into the filename of one of our .CPP files which uses regular C++ build rules and not a custom build rule and when that is done, I get an error message when a build is started:

cl : Command line error D8003: missing source filename

I have tried this on more than one PC and I get identical results.

The only Microsoft update that was installed since the last successful build was the March 2012 one.

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