Regarding total values only, this export script works for me ...
$filename(O:\TEST\Test.txt,ANSI)'Mp3tag version: '%_app%
'Following values are provided without a previous "loop/loopend" structure.'
'Total number of files (%''_total_files''%): '%_total_files%
'Total file size (formatted output) (%''_total_size''%): '%_total_size%
'Total file size in bytes (%''_total_size_raw''%): '%_total_size_raw%
'Total playing time (formatted output) (%''_total_time''%): '%_total_time%
'Total playing time (formatted output without days) (%''_total_time2''%): '%_total_time2%
'Total playing time in seconds (%''_total_time_raw''%): '%_total_time_raw%
Mp3tag version: Mp3tag v2.45a
Following values are provided without a previous "loop/loopend" structure.
Total number of files (%_total_files%): 4820
Total file size (formatted output) (%_total_size%): 24,92 GB
Total file size in bytes (%_total_size_raw%): 26755994213
Total playing time (formatted output) (%_total_time%): 13 days, 05:50:14
Total playing time (formatted output without days) (%_total_time2%): 317:50:14
Total playing time in seconds (%_total_time_raw%): 1144214
DD.20091215.1038.CET