Is there any way to automate converting just sln files from VS2008 to VS2013 ?

Question

My general problem is that we have a large number (approaching 300) of "local" sln files that have not been converted from VS2008 to VS2013 although their underlying vcproj files have (so they are now really vcxproj / vcxproj.filters pairs). 
This happened because these projects were converted along with "global" sln files that also contain these projects and are in fact used to build product.  The "local" sln files are more geared toward development, so the idea has
been to upgrade them over time as they need to be worked with in VS, which is still an option.  It should also be noted that these "local" upgrades must be done so that they do not redo the vcxproj files in any way or needed adaptations get
zapped and must be redone by hand.
So ... does anyone have a suggestion how to automate the conversion of these remaining sln files
without affecting the connected proj files?  devenv /upgrade does not seem to have the ability to leave the proj files alone unless I am misreading.

Answer 1

Hi A Jarrett,
Thanks for your reply.
I sugegst you will need to check if if
these files can be created in VS2013. 
Since the VS2008 is really old version, and generally we open an old project with the closed VS version, for example, I sugegst you could check whether you could open all files in VS2010, and then test it with VS2013.
In addition, I suggest you can try to open the your project solution using File | Open Project... and then pass the path to the solution project file check this issue again.
I find a similar thread about how to convert project from old version VS to VS2013, you can try the jsck's suggestion to check your issue.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/3d128a21-f3b5-430e-b146-60eea577194f/converting-vs-2005-project-to-vs-2013?forum=visualstudiogeneral
Best Reagrds,
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