You can simply export a number field so only the number values and not the commas for the thousands are exported, by defining a temp variable for the number field and assign the variable the value from this field; e.g.:

define temp “tNumberValue1″ number.

for Form1
;
tNumberValue1 := Field 3 .

list records
Field 1 ;
Field 2 ;
tNumberValue1 .

export to “c:\test.csv” .
.form header
Field1~Field2~Field3
.items
@f[1,1]~@f[1,2]~@f[1,3]
.end