Vb6 Double Versus .net Doubles In Binary Files?

I wrote some software in Vb6 a long while ago and this program creates a datafile. This datafile stores variables like doubles, ints, arrays etc, using the Get/Put methods from VB6. This all worked great for vb6.I am now starting to rewrite this tool in .net and find that the binaryreader as well as the other fileopen methods do not convert the doubles correctly. So as I rewrite the software I still want to read the old datafiles just like before.if I use a byte array and read 8 bytes, the bytes read are identical in Vb6 and vb.net. We are talking about reading an existing old binary file created by vb6.

for example the number 3, stored as a double has a 8 byte array that looks like this:

[0][0][0][0][0][0][0][5] in vb6.

in vb.net if you use the bitconverter.getbytes(cdbl(3)) you get

[0][0][0][0][0][0][8]64]

in vb6 the first array is converted to the # 3 correctly.in vb.net the array is converted to something way way off.