For windows 7 users, you need .net 6.0.4 anything newer no longer supports windows 7. The newest Rebirth Mids will infact run on this version.
Other than that, if the rumors are true that a near future mids release uses .net 7 windows 7 users will be unable to use it.
Redlynne, making something like the old RedTomax's hero builder (or even later SuckerPunch's Online Planner
https://cohplanner.com/ )wouldn't be that hard on a simple webpage with a bit of javascript. the hard part would be more tedious than hard; that would be writing a reader for the database information. for the future if they do continue to rambo update the .net version older OS users may have to resort to such an online builder, this would natively work on smartphones and tablets as well.
As a backup if you prefer something less online, Python could be used to draw up an app window with the TK module, again it'd be tedious work but you might get something workable in a few months with effort. can't vouch that the graphics will be great for the python one, though I suppose technically good graphics could be input.. and I don't know if python can even be installed on a phone or tablet, though it can be installed on a raspberry pi, so if it can't that means it's an OS developer lockout kinda thing. I know Apple has never been friendly to other content systems like flashplayer etc.
these are the options I know.
EDIT:
https://web.archive.org/web/20110824142004/http://planner.cohtitan.com/planner OH WOW IT STILL LIVES! Nope requires login. if it were online it'd be something like that. A drop down list that fills content in other drop down lists, which then generates a list of javascript links which update a form. where each entry of the form is displayed on javascript buttons, which target a row beneath them and reference the slot totals unassigned and max at 6. and the slots themselves will be javascript buttons which target themselves to load graphics and save stat info to a form, then one script to read it all and display a print out of totals, effects on a per power selected basis, and check boxes for the One Script to determine if a power is calculated in totals or not.
Tedious work. but it could be done.
Oh lastly it can be done in Flash +Actionscript. but as stated that wont work at all on iDevices because apple hates flash and always has.
You know what? I need to stop distrusting other people, and assume they would help. I'm going to talk tot he mids team about making a mids web version.