如何将文本回显到文件前缀由一个或多个env组成的文件中。带有空格的vars？

set overall_timestamp_first=2011-03-14 20.40.49
set overall_timestamp_last=2011-03-14 21.00.00
set overall_filename=\"%overall_timestamp_first%-%overall_timestamp_last%.txt\"
@echo Application Error Event Analysyis > %overall_filename%

D:\\Temp>dir 2*
 Volume in drive D is Something
 Volume Serial Number is ABCD-DCBA

 Directory of D:\\Temp

04/15/2011  09:03 PM                36 2011-03-14 20.40.49-2011-03-14 21.00.00.txt
               1 File(s)             36 bytes
               0 Dir(s)  204,289,437,696 bytes free

echo Application Error Event Analysis > \"%overall_timestamp_first::=% - %overall_timestamp_last::=%.doc\"