Currently file sizes are limited to LongInt (2147483647), today i'll go about upgrading it to an int64 which supports sizes up to 9223372036854775807 or there abouts
Unfortunately the TFileStream object used in FlashFXP will still be limited to a LongInt. Support for Int64 wasn't added until Delphi 6 and I use Delphi 4. If anyone happens to know of a way to provide Int64 support to Delphi 4 streams please email me at
support@flashfxp.com