After some word and excel documents were renamed automatically, the opening prompt was destroyed. The file name is signed with the symbol-$. Use the office2007 version, and get the answer.
The symbol with ~ $ is a temporary file that is automatically generated after the file is opened, and has no real content. When you quit the office software normally and close the file, this temporary file with ~ $ will usually be automatically deleted (for example, your document is named 1.doc, and when you open it, a ~$ 1.doc will be generated).