I developed and run a model in OpenStudio and needed to access the IDF file.
I tried 2 approaches:
1. Double click the (in.IDF) file from ...run\2-ModelToIdf-0.
I got this first warning 
Continued but the results has the following errors
"Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2015.08.03 10:12,IDD_Version 8.1.0.009
*** IDF Context for following error/warning message:
*** Note -- lines truncated at 300 characters, if necessary...
*** 4779 Sizing:System,
*** indicated Name=Packaged Rooftop Heat Pump
*** Only last 10 lines before error line shown.....
*** 4791 Yes, !- 100% Outdoor Air in Cooling
*** 4792 Yes, !- 100% Outdoor Air in Heating
*** 4793 0.0085, !- Central Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
*** 4794 0.008, !- Central Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
*** 4795 DesignDay, !- Cooling Design Air Flow Method
*** 4796 0, !- Cooling Design Air Flow Rate {m3/s}
*** 4797 , !- Supply Air Flow Rate Per Floor Area During Cooling Operation {m3/s-m2}
*** 4798 , !- Fraction of Autosized Design Cooling Supply Air Flow Rate
*** 4799 , !- Design Supply Air Flow Rate Per Unit Cooling Capacity {m3/s-W}
*** 4800 DesignDay, !- Heating Design Air Flow Method
* Severe * IP: IDF line~4800 Invalid Number in Numeric Field#13 (Zone Maximum Outdoor Air Fraction), value=DESIGNDAY, in SIZING:SYSTEM=PACKAGED ROOFTOP HEAT PUMP
* Warning * IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.
* Severe * IP: Possible incorrect IDD File
* ~~~ * IDD Version:"IDD_Version 8.1.0.009"
* ~~~ * Version in IDF="8.2" not the same as expected="8.1.0"
* ~~~ * Possible Invalid Numerics or other problems
* Fatal * IP: Errors occurred on processing IDF file. Preceding condition(s) cause termination.
...Summary of Errors that led to program termination:
..... Reference severe error count=2
..... Last severe error=IP: Possible incorrect IDD File
*** Warning: Node connection errors not checked - most system input has not been read (see previous warning).
*** Fatal error -- final processing. Program exited before simulations began. See previous error messages.
*** EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
*** EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
*** EnergyPlus Terminated--Fatal Error Detected. 1 Warning; 2 Severe Errors; Elapsed Time=00hr 00min 1.35sec"
- Following the path C:\Program Files\OpenStudio 1.7.0\share\openstudio\EnergyPlusV8-2-0 to open EnergyPlus Version 8.2 and call the said file (in.IDF) but got this error
.
Any idea?
