When tring to open an assembly file located on my hard drive, I get a message that the file "...is being used by another user. Do you want to open a copy?" It will open a copy in Read-Only. Some background: I was working with this large assembly on the network but sometimes it gets slow. So I did a Pack and Go to my hard drive. I was able to open it and do some work on this file before the holidays. Came in this morning and opened the file but got this message.

Thanks in advance for any insight!