Word: tmp
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These are called temp files; they are files that end in "tmp" and are created when you open a document and are contantly updated as you revise the document. They often have weird names such as "~bt00099.tmp" and are erased when you close your document. You would never think to look for them...
...find which temp file has your paper, use the find program to search for files ending in "tmp" or files whose date matches that of the programerror...