1. 第一個位元（Ｆ）：Signature UI8 Signature byte always “F”
2. 第二個位元（Ｗ）：Signature UI8 Signature byte always “W”
3. 第三個位元（壓）：Signature UI8 Signature byte: “S” indicates
uncompressed “C” indicates compressed (SWF 6+ only)
4. 第四個位元（版）：Version UI8 Single byte file version (e.g. 0x06 for SWF 6)
5. 第五～八個位元（大）：FileLength UI32 Length of entire file in bytes
6. ＲＥＣＴ Frame Size 資訊：FrameSize RECT Frame size in twips
7. 兩個位元（延）：FrameRate UI16 Frame delay in 8.8 fixed number of frames per second
8. 兩個位元（格）：FrameCount UI16 Total number of frames in movie
參考資訊：
[1] Flash (SWF) File Format Specification, 2003, Macromedia
[2] http://www.openswf.org/, 2003, OpenSWF.Org
SWF (V.6) Header Format Spec. swf_header_spec.gif
