This is what currently occurs when a PK3 file is opened from within SLADE. from Windows Explorer) then SLADE will automatically open the PK3 file in a new tab, and if the same PK3 file is already open, either nothing happens or the user is then prompted with a warning (e.g. Recommend that if SLADE is already open with a PK3 file, and any further PK3 files are opened with SLADE (e.g. There will now have two instances/windows of SLADE open with the same PK3 file which can lead to unintended results when changes are made in one instance/window and not the other, especially if this is not observed by the user. Unlike a new tab, files cannot be copied from one instance/window of SLADE to the other.Įven worse is if the second PK3 file you open is the same as the first PK3 file. As an example, if SLADE is already open with a PK3 file, and then you open a second PK3 file from Windows Explorer with SLADE, a new instance/window of SLADE will open, resulting in two active SLADE instances/windows. If you know the application which can open PK3 file then run it and see if there is a File->Open main menu option in the application.