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I use NTFS compression on some folders, I understand the pros and cons of this, but for my use case it is preferred.

I have noticed some odd behavior for many years. Some applications do not "honor" the directory compression flag.

I have never been able to determine why this is so. I'd like to understand the reasons and if there is any way to "force" and application to honor it.

Currently I just use a batch that runs compact from time to time on the required folders.

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Do you mean that the compression checkbox is unchecked altogether?

Probably what's happening is that those applications are creating files somewhere else then moving them into the destination folder. A move on the same partition won't force the compression to be applied because of the new parent.

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You were right. The move is what was causing it. Much of the time it is a move from the %TMP% directory. – Wayne Arthurton Mar 12 '11 at 20:09
A move also won’t respect the permissions. – kinokijuf Feb 12 at 19:27
@kinokijuf: Only on XP. Vista and 7 apply permissions of the target on moves now. – afrazier Feb 12 at 21:02
@afrazier Only if you have „easy file sharing”. The filesystem hasn’t changed at all. – kinokijuf Feb 13 at 12:36
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