The Sumatra PDF portable apps product page states that Win9x is supported, however the product website states otherwise (ref: http://forums.fofou.org/sumatrapdf/topic?id=4922&comments=1). Whilst it is possible to run the app, the menu bar doesn't display, and viewing multipage/non-standard sized pages can be difficult to navigate.
Are there any other PDF viewer options that are fully Win9x compatible (and portable)?
I hadn't updated the OS compatibility info. I've updated it to indicate that it is Windows 2000+ and that Windows 9x users can get 0.8 which partially works. I don't think there is another PDF reader that works on Windows 9x at all at this point, so you could continue to use Sumatra PDF 0.8.1.
This year seems to be the end of the line for all Windows 95/98/Me support across nearly all software. FileZilla, Sumatra PDF, GIMP, Pidgin, Firefox, Sunbird and more have already dropped Windows 9x support. AbiWord, OpenOffice.org, Thunderbird and other all will in the next release. Honestly, the fact that Firefox 3 drops Windows 9x support will probably spell its end more than anything else once Firefox 2 is no longer supported (which is only months away).
Your best bet is to at least upgrade to Windows 2000 (an eight year old operating system that will run quite well on most hardware that runs Windows 98 or Me) as most software will be supporting that for a while due to the similarity in API calls.
Sometimes, the impossible can become possible, if you're awesome!
Thanks for the tip John - I'll check out the older version.
Unfortunately the PC in question is at a client site that for whatever reason can't be upgraded, so I'll just have to make do.