I have multiple iTunes libraries on TC. The file for the main library exists, but i cannot open it up. What should i do?

The one I'm trying to open up is about 150GB, and it has someting like 9,000 songs. But I cant open it up, and I dont want to lose years of collected music. Please help!

I too had this problem and have solved it. After upgrading to iTunes 10.4.1 (Running OS X 10.6.8) I could no longer select library files. Previously, I would launch iTunes with the option key down to trigger the "Choose Library" dialog box. I have three libraries, each of them stored in separate iTunes folder within my user:music folder. I would then double-click on a given folder to open it and then double-click on the library file. After the 10.4.1 upgrade the library files were grayed out (not selectable). The problem was resolved by changing what and how I selected. When the three iTunes folders were displayed I clicked once on a folder to select it (instead of double-clicking to open it) and then clicked the "open" button in the dialog box. This resulted was iTunes launched with the library file contained in that folder.

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