Domain users accessing work-group server

At a loss on this one.

I have a 2003 server in a work-group that host old applications. Users run EXE through a UNC or mapped drives. Groups and users were created on the server and matching on the PC side.
There is a separate office I have installed a 2012 server with Active Directory. These users still need access to those programs.
The weird
I joined a computer to the domain, logged in as the domain admin, mapped the drive as a work-group user and can pull up all apps. If I log in as a domain user I cannot access two of them.

I tried
 
Giving the “Everyone” group full permission to the folder
Gave the domain user local admin rights
Gave the domain user domain admin rights
I have checked and ensued the mapped drive is using the local account to map and the password is correct.

I cannot promote the server to a Domain Controller. Any other ideas would be appreciated.
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JasonDuncanworksAsked:
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JustInCaseCommented:
When you mapped drive, did you use UNC path or IP address for sharing?
Since that server is not part of domain - probably there is a problem to resolve hostname to ip address since it is not in AD database.
Try to share with ip address
\\192.168.10.15\share
Santosh GuptaCommented:
What I understand,

you have a workgroup machine with 2003 OS and you want that from other Domain joined machines, user can access the application/folder of 2003 server. if yes, then

1. create a Group in active directory named ABC.
2. Add users in ABC those wants to access that application.
3. Go to 2003 workgroup machine.... add ABC group to local administrator group (for testing).
4. now try to access that application from domain pc.
JasonDuncanworksAuthor Commented:
Thank you for your responses,

@Predrag Jovic -  I mapped the drive from the IP address and got the same results.

@Santosh Gupta - I created the group on the 2012 Domain Controller but on the 2003 work-group computer there is no way to add that group. When you go to add Groups / User the only location it can see is itself.

Its not access to the folder that is the issue. Its when launching the program that brings up an error. If I log in to the computer as the domain admin, map the drive as work-group user and I can launch all programs. If I log in as a domain user, map the drive the same way it does not work.
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Santosh GuptaCommented:
Ohh.. do u use Windows Vista or later. Then try to disable UAC  and check.
JasonDuncanworksAuthor Commented:
UAC is disabled. I have added the domain user to the local admin group and still have the same issue.
Santosh GuptaCommented:
Did this application works with other workgroup pc?
What is the application name ?
Any error or event in application log in desktop.
JasonDuncanworksAuthor Commented:
Yes application works while logged on locally.
Its older system for a court, its just a click to run exe.
Nothing in the event log.

It works when logged in locally or as the domain admin.
JustInCaseCommented:
Is the same letter assigned to mapped network drive in both cases - when you log as domain admin, and other users?
Some applications have absolute paths assigned and drive letter must be what application expects it to be.
Santosh GuptaCommented:
on the local machine, access your drive like \\localhost\d$\app and try. I think your app does not support UNC path.
JasonDuncanworksAuthor Commented:
Ended up being an issue with the software. It check the login name of the the computer and uses that as access. Thank you for everyone's help.

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JasonDuncanworksAuthor Commented:
Found answer elsewhere.
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