A read lock on the file that you are attempting to open can be caused by another user who has the file open, either on the ...

A read lock on the file that you are attempting to open can be caused by another user who has the file open, either on the same computer that you are using or from another computer. It is also possible for another application to place an exclusive lock on the file, which would prevent Word from opening the file. If a custom application is currentlyrunning on your computer, or someone else's computer, and has opened this file, it may have opened the file using an incorrect method.