I have just realized .mht does not open in edge because edge does not actually support .mht files. You will have to convert it to a .htm or /html or .pdf to read it outside of edge.
default file types opened by Edge
Why can't I open .mht files with Edge? I am forced to set up and use Internet Explorer.
Windows for home | Windows 10 | Settings
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Anonymous
2018-07-05T18:20:22+00:00 No. The only option available is IE.
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Anonymous
2018-07-05T18:17:06+00:00 Hello. If you go into settings > Default apps > scroll down to "choose default apps by file type" > scroll to .mht > are you able to set a different browser as default for those files?
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Anonymous
2018-07-05T18:16:32+00:00 Sorry, my reply was for a different post. Please ignore.
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Anonymous
2018-07-05T18:15:55+00:00 It should be here: C:\Program Files\WindowsApps\microsoft.windowscommunicationsapps_17.7167.40721.0_x64__8wekyb3d8bbwe\hxtsr.exe
If you have already removed it or it isn’t there then please run sfc:
Right click start>cmd prompt/powershell with admin & enter
sfc /scannow
this should fix it.
If it doesn’t then it may be malware.
Please post back if that is the case.
I hope this helps.