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Question: Inert add and filenames

Question:Inert add and filenames

vv 13035 Maple
value filename add
December 29 2018
3
> 

add(add(1,i=1..j),j=1..4);

10

 (1)
> 

S:=%add(%add(1,i=1..j),j=1..4);

%add(%add(1, i = 1 .. j), j = 1 .. 4)

 (2)
> 

value(S);

Error, (in value) unable to execute add

  

It seems that the inner add is evaluated prematurely.

 

> 

eval(subs(%add=add, S));  # ok

10

 (3)
> 

subs[eval](%add=add, S);  # ?

Error, unable to execute add

  
> 

 

 

A strange fact about filenames. 
Some  filenames containing the "%" character cannot be loaded by Maple.  E.g.  "%add.mw"  or "xx%abyy.mw".  But "xx%yy.mw" is OK.
This happens in Windows, but I suspect that it is not OS related.  It seems that Maple is trying to do some hex manipulations with the filename.
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