batch file - How do I turn the content of a var in an absolute path? -

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Suppose i have this: 

  set x = ..

How do I change it later in a complete path? Can you please write about how it would be in a script?

I tried with % ~ dpx , but he gave this error message: The following use of path operator is invalid in batch-parameter replacement:% ~ dpX < / Code>

After a lot of searches, I've found a way to do this: %% y 

  X = %% ~ dpy
for in (% x%)

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