I do not recall deleting or changing the name of this file. It has several months worth of work in it. The file name appears with an exclaimation point. When I try to open it I get the error message attached.b

[attachment deleted by admin to conserve space]Strange location for file to be saved so DEEP into a tree path from PROFILE off of the appdata location. Wondering if you lost it because you EXCEEDED the path length....

If you perform a search on your system for "Ronnie Oldfield TBT 2015.xlsm" do you find it located in any other location on your system?  Your system is reporting that it lost access to the file or the file no longer exists.
Thank you for your reply. Tried system restore for a second time and recovered it.Awesome ... be sure to save it to another location though as well as any other IMPORTANT data so that if you ever lost your hard DRIVE you wouldnt lose your data. A cheap $5 USB Flash Drive is so worth it.

Other option which is free is e-mail yourself your files after you work on the most important of ones. I use to use my Yahoo e-mail acct years ago before cloud storage as a cloud storage for files lesser than 10MB in size.

These days with cloud storage if you dont mind your data being elsewhere you can use one of those as well such as Google Drive etc.

I still like USB sticks and external hard drives though for maximum privacy as well as faster transfer of files vs through internet connection.