what do you mean by 'mine' -- the one you had before the unexpected bump to 100mb ?
Or the one I uploaded to dropbox?
If you're thinking 3mb is too low and something's wrong, i doubt it. Have been using the 2daEditor for years and it's never kicked an error like that (user error, yes). But i just pulled your 100mb file in, compressed it (the editor uses tab-delimiting) and output it. I've done the exact same procedure to every stock .2da in the game and they work fine. Now, the 2daEditor might have a problem with files that are 100mb, but i doubt it. Ultimately it's on your shoulders, PJ, so i suggest you do the 'compression' yourself.
I'll just say that a size of 3mb is in accord with other large .2das I've compressed down,
my Spells.2da (Kaedrin's) is 857kb (byte count: 877,118, word count: 72,394)
my Appearance.2da (pain's) is 1.3mb (byte count: 1,324,895, word count: 81,633)
my previous Placeables.2da, ranges from 1.7mb to 3.1mb (don't know where i got it from.. but the large version has 23564 entries and is dated august 2012) (byte count: 3,214,535, word count: 104,851)
So, the huge new Placeables.2da, also w/ 23565 entries (byte count: 3,230,036, word count: 119,193), doesn't strike me as 'wrong'. IF this is what you're getting at bro,
i trust nwn_2daEditor to do this operation.