Old build that works correctly
`MP4Box - GPAC version 1.1.0-DEV-rev1161-g2dfbf0c7a-master`


Newest build I've tried
`MP4Box - GPAC version 2.1-DEV-rev243-gf87b12b32-master`

Example long file path/name
`"\\?\E:\Downloads\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxx\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxLONGER123_temp\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxLONGER123_chapters.txt"`

**Error:**
When muxing long filenames on newer versions of mp4box, it displays an error such as this during muxing
`Track Importing MPEG-4 AVC - Width 1792 Height 1080 FPS 96000/4004 Error: Requested URL is not valid or cannot be found`

I do understand the pathname is very long. However, I figured since the older versions had no issues with this, maybe it's something you could look into?

Thanks!!
Long path name error with newer versions (MP4Box)
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Long path name error with newer versions (MP4Box)
Issue date:

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Old build that works correctly
`MP4Box - GPAC version 1.1.0-DEV-rev1161-g2dfbf0c7a-master`


Newest build I've tried
`MP4Box - GPAC version 2.1-DEV-rev243-gf87b12b32-master`

Example long file path/name
`"\\?\E:\Downloads\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxx\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxLONGER123_temp\Rocky.Horror.Picture.Show.The.1975.BluRay.1080p.DTS-HD.MA.7.1.AVC.REMUX-xxxxxxLONGER123_chapters.txt"`

**Error:**
When muxing long filenames on newer versions of mp4box, it displays an error such as this during muxing
`Track Importing MPEG-4 AVC - Width 1792 Height 1080 FPS 96000/4004 Error: Requested URL is not valid or cannot be found`

I do understand the pathname is very long. However, I figured since the older versions had no issues with this, maybe it's something you could look into?

Thanks!!
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