sln files doesn't open

Hi for all

I'm using Visual C++ Express Edition(2005) and I'm trying to open the OgreBullet_SDK.sln as informed in the readme file.
The problem is occuring because visual studio doesn't recognize what visual studio version the sln belongs.
Someone can help?

sometime, it happen to me. My solution is to open Visual Studio without loading any project. Then, load the project with File->Open->...

To know if you can open a .sln, check the icon. If there's a small number, you can open it. If not, you can't.

To make a permanent working .sln, you should do: File->New->"Project form existing code...". And you manually find the .vsproj file.

I hope i have been useful!