If anyone is downloading the original Half-Life SDK and possesses any version of Visual C++ 2010, will not be able to open the project file(s) properly. The way to get it to run through Visual C++ 2010 (any version) is to at least download Visual C++ 2008 Express (or any other version will work if owned) and open it there. After converting it and saving it, then load it through Visual C++ 2010 (as stated, any version).
Now convert it and y'all should be able to use the original SDK with no problem. Of course it would be easier to use the Visual C++ 2008 version provided on here, but makes for a handy learning experience.
Edit: Oh yes, don't forget to make any changes when using the original. As stated of course, there is a provided Visual C++ 2008 edition that makes it easier.
Bandock
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