I have a .ssmssqlproj file in a Sharepoint folder, but I cannot delete it. It says that some application may currently use it. That is not true, because I don't have SSMS open. How to delete this SQL Server Management Studio project file?
Tools like Process Explorer (use the "find handle or dll" function) will tell you what processes have a file open (with delete lock). This allows you to know what to close to allow deleting.