Well the following post : https://portableapps.com/node/1774 seems to be closed, so I'll re-open it here 
I think building an app that would mount iso's is possible, because the following app :
http://www.yadabyte.com/Yadabyte_Portables.php
(look for Yadabyte Disk)
can mound an encrypted disk, and I don't think it requires administrative rights.
Note : yadabyte disk is marked as "temporarily unavailable" bu once I managed to download it - not the source code however ;( - by hitting random files - it's file number 56 or something like this
I've contacted the author and I'll se if he can send me the source code.
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Thinking about that yesterday, I was just looking for a good open source one, I'll look into it. It's especially handy for things like Linux and the OpenCD.
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I don't know about open source, but UltraISO works portably and can mount ISO images.
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at isobuster.com
'tis freeware (the basic version, anyway), works portably.
Prolly not open source, tho'...
"I don't hate cats...as long as they stay on the freeway, where they belong."
- Brad Stine
Mounting a filesystem requires admin rights. Period.
Vintage!
I use MS Virtual CD-ROM Control Panel v2.0.1.1
Works great with Admin rights and I just carry the driver on the usb to install as needed -
Okay for me, I usually only need to use an image at a friends house, who would have admin rights.
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I felt so different without a signature.
I mean doesn't the file system from a usb drive mount without admin privleges? Wouldn't it be possible then to mount a virtual usb-cd-rom drive without admin priv?
Virtual CD requires a driver. Which requires admin privs. Period. End of story.
Sometimes, the impossible can become possible, if you're awesome!
fair enough