Limiting the growth of system cache ?

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Hi,

There is a big (~200 GB) file on NTFS partition. The application that writes this file consistently allocates half of the available RAM to the file cache. How can I limit this amount ? It's really useless for mostly sequential file writes, and worse, causes swapping when the application needs to reclaim that memory for itself.

The file is managed by a third-party code, so passing different set of flags to CreateFile() is not an option.
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