When I open an old file and try to edit, it says "document X.SLDPRT is opened for read-only access and is not available for write access". Why do I not have write access for a file I created? Does it depend on how I open it? I tried opening from solidworks and from my windows explorer.

Edu ​​​​​​​3DEXPERIENCE ​​​​​​​SOLIDWORKS ​​​​​​​