Opening Solution with Visual Studio 2008 is broken

Some of the the Solution icons are broken and appears as follow.

I can simply load this using Visual Stud开发者_Go百科io and I manually confirmed the content of the solution file to make sure that there's nothing wrong. But still some of the icons appears as above and I can't open on double clicking.

I can simply open the proper solutions which displays the solution icon as follows.

How to fix this issue?

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You can always try recreating the solution from scratch. It only takes about a minute. Rename the existing solution and create a new empty solution and add the projects one by one. Once the new solution is in place, use a diff tool to figure out why the old one is acting strangely. My guess is that someone tried editing it manually and they hosed some of the formatting.