PR3 file extension is for:
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Similar to PR3
A4L - Authorware Version 4.x LibraryA4P - Authorware File Without Runtime
A5W - Unpackaged Authorware Windows File
A60 - Roland Garros Tennis MVTS File
A64 - Artist 64 file
A6P - Authorware Application
A8 - Alpha channel image data 24-bit 3D animation Cubicomp PictureMaker
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