Adobe MPEG Index File
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What is an MPGINDEX file?
MPGINDEX files are cached when new videos are imported. This provides the Adobe software a substantial performance improvement when accessing video content. However, there may be a delay the first time the video data is cached.
NOTE: MPGINDEX files are actually created by Adobe Media Encoder, a software component that is included with Adobe applications such as Premiere Pro, After Effects, and Encore.