[plt-scheme] directory-list in DrScheme version 350

Hello,
 
I have developed an interface coded in version 209 of DrScheme (including
MrEd) and it used to work fine. 
 
Recently I downloaded the version 350 and I have errors when reading files
from directories ( with "directory-list" ). It seems that the format of the
output has changed, but I did not find any description of the changes.
Instead, there seems to be a new function "path->string" that converts the
paths to a string. 
 
Is it normal that a newer version does not support previous-versions code?
 
Thank you!
Ivanka
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