Error opening .fla file? (Please help)!

Hi, I have been working on a .fla for quite some time now. Earlier today I worked on it as usual, saved as usual and didn’t notice any problems. However, when I went back to it this evening I went to open the file as normal and I get a error message saying, failed to open file. sometimes a second error message appears sayin javascript error and that it cannot find file in its location? But the file has not been moved or anything that could have caused this! I really don’t know what to do, does anybody have any ideas/solutions that i could try so i can load this file, has anyone else had this problem and manage to solve it? Please help, I am worried that I have lost all my work.