SWF To Image library is capable of converting SWF movies into BMP images:

A screenshot of the source flash movie (sample.swf)

SWF To Image library is freeware. However you are welcome to purchase 12 months tech support for it and so support development of SWF To Image library.
12 Months Tech Support via e-mail for SWF To Image library ($95 USD)

Now converting SWF flash movie into BMP using SWF To Image library and the following code:

' This example converts SWF file to BMP

Set SWFToImage = CreateObject("SWFToImage.SWFToImageObject")
SWFToImage.InitLibrary "demo", "demo"

SWFToImage.InputSWFFileName = "sample.swf" ' input SWF file
SWFToImage.Execute
SWFToImage.SaveToFile "sample.bmp"

The screenshot of produced output BMP image (sample.bmp):