I was about to export my recording (has been saved before), and then my computer restart itself (I assume it crashed also as I didn't do anything). After the restart, I tried to open my previous project to export the files, it has no auto-recovery message, but then it said, "Audacity did not recognize the type of the file 'D:/files/..... .aup'. If it's uncompressed, try importing it using 'Import Raw." I tried to load other projects and they load just fine, it's only the recent project.
I'm using the latest Audacity, my OS is Windows 7
Does anyone know how to solve this problem?