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You shouldn't need to make the source files writeable in order to build, but if you really want to, check the 'Make local non-checked out files writeable' option on the Flags tab of the SourceSafe action that you're using to get the source files.
To remove the read-only attribute of files already on disc, use a Run Program step like (replacing %TEMP% with the path for your source files):
%ATTRIB(%TEMP%\*, -r)% /s
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