>>What about to use the number of records to have an aprox. proportion ? (on FPT and CDX)
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>Why, if getting the file size is so easy?

you're completely right.. I had a wrong perception of the limit of # of records..

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>On CDX, you might estimate size per record, based on existing data. Due to data compression, this may not be exact.
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But increase exactly as the number of records.. This result can be done with more precision..

>On FPT, it is even worse; the users may start to store longer comments, or whatever is stored in the memo fields.
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Here is the point where more concerned me.. To admin. this

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>What is so weird about this? 3 million (3e6) is much less than 2000 million (2e9).

LOL, on all of my entire time working with V.F.P. I've been thinking on 2 millions.. hehehe.. very funny stuff.. Just by now I realize it is two thousand million.. Not, two million.. hehehe, This is why some end-user never call me.. I'm speaking seriously.. How stupid I am !!