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Ok after hours I finally got it to work but it took additional steps not mentioned in the initial post I had to jump around to find enough info. I was having trouble viewing particular html5/h.264 videos and the like on firefox portable 48.0, test pages showed negative for h.264 support. First I tried the latest FF portable 52.2.1ESR but still no joy. Since I run a portable version of firefox 48.0 I made a mirror copy of that to alter in case I messed up. BTW I'm running winxp 32 w/sp3 First I added the files into my FF profile folder as described on post 1. Then I added/edited these 9 lines in about:config as described. media.gmp-eme-adobe.enabled (boolean, true) media.gmp-eme-adobe.forceSupported (boolean, true; FF 49.0+) media.gmp-eme-adobe.forcevisible (boolean, true; FF 45-48, no longer used in 49.0+) media.gmp-eme-adobe.visible (boolean, true; FF 49.0+) media.gmp-eme-adobe.version (string, 17; required for manual install now that automatic install is no longer an option) media.gmp-eme-adobe.abi (string, x86-msvc-x86; not required, you can set it if you want to more closely mimic automatic install) media.gmp-eme-adobe.lastUpdate (integer, 1500000000; not required, you can set it if you want to more closely mimic automatic install) media.gmp.decoder.enabled (boolean, true) media.eme.enabled (boolean, true; defaults to false if you downloaded a DRM-free version of FF SO after all this nothing changed so I went further into the thread and found these additions, I'm not sure if one or all of them made the difference. I opened add-ons and right-clicked the primetime content encryption plug-in and selected find update, I think it does something but I'm not positive. BACK to about:config I rechecked all my added and changed lines, it seemed one or more were missing or not true ect. I'm not sure if this was my fault or not. checked media.gmp-manager.url I had to simply replace the %VERSION% part in the long url with 48.0, of course you will put in which ever version you have. I opened add-ons and right-clicked primetime content encryption and selected find update again. I rebooted and my videos played! Thanks gang.
Just a warning, I installed the nusb22e.exe on my win98se machine and was not able to boot up after. first I got a message saying IOS.vxd in "C:\WINDOWS\SYSTEM\VMM32" was corrupted or missing. Went into safe mode and after searching found that there were 3 instantces of IOS.vxd so I copied one of these extra IOS.vxd's and replaced the 'corrupted" one and rebooted. This stopped the bad IOS.vxd message but still no joy as it would just hang and never reach the desktop screen. Going back into safemode I saw in my 'system' that there was now an "unknown device" where there had'nt been before I ran this program. Tried disabling and even deleting it but I still can'nt boot up fully. Luckily I keep a spare HD with my OS on it which is what I'm useing now but unless I can figure it out I fear I will have to do a full ghost copy of this drive to get the other functioning. I can't say why this happened to me but be careful. What I can tell you is after searching for IOS.vxd on this extra HD I could only find the one instance in "VMM32" so it would seem this program probably creates/manipulates that file.
I know win98se has a 512mb ram limitation. I saw this "Windows 98 SE Service Pack 2.1a" which claims to 'solve the 512mb problem'. Would this be a good idea to try or is there a better way? heres the link. http://download.cnet.com/Unofficial-Windows-98-SE-Service-Pack/3000-18487_4-52713.html