Hi!
First, D. Fosse is correct—all you have to do is open them, because Photoshop is backwards compatible with all old files. But your statement about "files without any file information like layers or colors" is unclear. Are you trying to open files with no layers? Just a background layer? Or are you wanting to make sure that your files with layers will still be intact?
When you open an older Photoshop file, if it had layers, the layers would still be there, if it didn't then the file will open just as it was previously saved. If your file has layer styles or layer effects, they will also be compatible with your current version. Colors might be a different issue, all depending on what Color profile was assigned to the previously saved file and what color profile you have selected in your current version of Photoshop. But, that said, you can easily match the color profile after you open it and resave it.
I hope that helps, but if that doesn't answer your question, please let us know.
Michelle
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