The Batch File name is read from win.ini in the windows folder.

Use the keyword PageN, where N is the Page Number from 1 to 100.

The file name needs to be setup BEFORE the batch recording starts.
Changes in filename are not effective until the next batch starts.

Examples

[BatchFileName]
Page1=Page 1 Batch.DAT
Page10=Oven Test 30 May 2000.DAT

Use the Windows APIs WriteProfileString and GetProfileString to read and write win.ini in your program.