Windows 11 · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Describe the local-file task
Start with a particular file and action: for example, selecting a subtitle you created from Documents or opening a video you own from Videos. Note whether the app cannot list the folder, cannot read the chosen file or opens it and then reports a format problem. These are different observations.
Review the relevant Windows category
Microsoft documents File system under Settings, Privacy & security, with overall and applicable individual app choices. Pictures, Videos and Documents also have library access controls. Choose the category related to the actual location rather than turning on every privacy category in the hope that a player will begin working.
Respect the desktop-program exception
Microsoft warns that some programs installed from the internet or other media do not appear in the file-system permission list and are not affected by that switch. An absent entry is therefore not proof that the program has no file access. Inspect its own documented settings and the actual user account’s file permissions where appropriate.
Use a safe representative file
Try an unimportant file in the same relevant location, using the app’s normal file picker. Keep a note of the original privacy choices. If access succeeds but decoding fails, stop widening permissions and investigate supported formats instead. Sharing the path structure and error can be useful; sharing a complete credential-bearing configuration usually is not.
Questions, answered
Does every desktop program appear in File system privacy settings?
No. Microsoft documents exceptions.
Should all library permissions be enabled for one error?
No. Check the actual task and relevant location.