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When Index Manager indexes filenames, they are interpreted using the codepage you have selected in the Regional Settings Control Panel in Windows. Characters A-Z are always read correctly, but if you plan to index files with e.g. Cyrillic or Greek characters in the filename, you will need to make sure that you have selected that character set as Windows’ default codepage.
This is done by opening the Region and Language configuration menu, where you will find an option called “Change system locale” under the Administrative tab:
Caveat lector: I used to work with support at FotoWare. This blog is my own space, I am not paid to write it. I write about FotoWare and FotoWare products because I believe in them.