When you are opening the drawing with the File -> open. Click References befor you hit open and select your file (update references).
SolidWorks uses associated file management. Associated files stay
connected by filenames. When a document name is changed and one of the associated files is
not updated properly, the association between the files can become broken. For this
reason, you should use SolidWorks or SW Explorer to change names of
associated files. Other techniques will work, but you should avoid some techniques.
It's bad practice to change filenames, locations, or the name of a folder in the path of documents that are referenced by other documents with Windows Explorer. Links between parts, assemblies, and drawings can be broken in this way.
Using SW Explorer or a PDM application is the preferred method for changing filenames.
hope this is clear for you- have a good'n kelef