Question: worksheet incomplete

hey, I've made a almost all  of my mechanics work during the past year in a single Maple document. Now, for som reason, the document wont opendue to "There were problems during the loading process. Your work sheet may be incomplete" please help my, I would really hate loosing so much work...

Btw. mapleprimes wont let me upload the failed file so if someone could either post a guide/torturial or there email I would be vey pleased.

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