You can explicitly specifiy a file using the path and filename tag; for example:
Windows:
[c:\\acufiles\\file1.dat] IDXFORMAT=17 [c:\\rmfiles\\file1.dat] IDXFORMAT=21
[C:\SITETEST\EXTFH\TEST2.dat]
you would need to enter
[C:\\SITETEST\\EXTFH\\TEST2.dat]
This applies to Windows environments (local development) only.
UNIX:
[usr/acufiles/file1.dat] IDXFORMAT=17 [usr/rmfiles/file1.dat] IDXFORMAT=21
sets file1.dat in c:\files\acufiles (Windows) or usr/files/acufiles (UNIX) to IDXFORMAT 17 and file1.dat in c:\files\rmfiles (Windows) or usr/files/rmfiles (UNIX) to IDXFORMAT 21.