Windows need quotes, unfortunately.

share/qtcreator/static.pro

@@ -41,7 +41,8 @@ DATA_DIRS = \
     copy2build.input = FILES
     copy2build.output = $$IDE_DATA_PATH/${QMAKE_FUNC_FILE_IN_stripSrcDir}
     isEmpty(vcproj):copy2build.variable_out = PRE_TARGETDEPS
-    copy2build.commands = $$QMAKE_COPY ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
+    win32:copy2build.commands = $$QMAKE_COPY \"${QMAKE_FILE_IN}\" \"${QMAKE_FILE_OUT}\"
+    unix:copy2build.commands = $$QMAKE_COPY ${QMAKE_FILE_IN} ${QMAKE_FILE_OUT}
     copy2build.name = COPY ${QMAKE_FILE_IN}
     copy2build.CONFIG += no_link
     QMAKE_EXTRA_COMPILERS += copy2build