I would like to change the name of a part file, the problem is that when I open the drawing file, the part disappears and I can't recreate the link with the new part file name (under SW2012). On older versions, SW offered me to tell him the new file name, but not anymore. How can I do this? Thank you
This is a fairly classic mistake.
You have renamed your room from windows explorer, big mistake!, if I may say so.
So your drawing, which used to point to your room named "x", still points to "x", except that "x" no longer exists because your room is now called "y".
I hope you follow me.
Several solutions are available to you:
First, when you open your drawing, you should get a message like: Unable to find the C:\ users\...\name file of your old parts.
-Do you want to look for it yourself or
- Delete the component
You can then search for it manually
If you don't see an error message, you can do the following:
From Solidworks File > Open > point to your > drawing and click the "Reference" button> you can then double-click on the name of your old part and hover over the new name.
Other methods, from your "empty" drawing: File> Look for the references > and double-click again on the name of your old part, to point to the name of the new one.
Basically, renaming parts or drawings or assemblies for that matter, is the same thing as moving these elements in windows, the result is that Solidworks is lost, and it no longer knows how to find the elements.
THE SOLUTION

To rename or move, or repoint the right references, the solution is to do it via Solidworks Explorer, which will "keep all the references" automatically, whatever the manipulations.
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You'll find out for next time!