Are you opening PP from a shortcut on the desktop or from Windows Start Menu?
In the past these options have gone wonky on me and I check that I can start it directly from the program executable file...
"c:\program files (x86)\reckon accounts personal\qw.exe"
one other option is to right mouse click on your data file (*.qdf) and choose either 'open with quicken or the 'open with...' option.
If either way works I would delete your shortcuts/remove from start menu and re-create your shortcuts
Just tried to open it from the file location as you suggested and same issue. I also ran the compatibility troubleshooter (I have windows 10) and I can't even get that to see if it would work on windows 8. I click the test button and nothing happens.
Also tried "open with" on my data file and nothing happens, just a blank Reckon screen and no buttons work.
If so do a rename without spaces and restrict to 8 letters/characters - Quicken/Reckon doesn't seem to like the 'new' Windows filename format and without reason did the same thing to me out of the blue.
Sorry to hear your problems are persisting. RAPP2017 is designed to work with Windows 10 so compatibility is not an issue here.
Let me review your situation.
You were working with your RAPP2017 on a Windows10 PC for some time when suddenly you could not open your datafile. You could open the programme but you could not open your datafile from either the File Menu in the programme or by clicking the datafile itself.
Question 1 - were you able to open the sample file SAMPLE1.qdf in C:\ProgramData\Intuit\Quicken\Sample\?
Question 2 - were there any changes to your computer environment (auto updates; new programmes installed; maintenance, etc) between the time of your last successful use of RAPP and encountering the problem?
Question 3 - what is the location of your datafiles? My Docs folder? C-drive? Network drive? USB?
You tried a number of things including renaming the datafile and restarting the computer and later the problem seemed to rectify itself.
A week later you uninstall and reinstall RAPP and have the same problem. You can open the sample file.
Question 4 - why did you uninstall and reinstall? Error message? Loss of functionality?
Question 5 - when opening your datafile from the File Menu, are you selecting it from the previous opened files list or through the option File > Open > .... etc?
At this stage I am thinking that from time to time, there is a problem with the programme accessing the location of your datafile. Do a test - create a new file and save it to your Desktop. Is there any problems accessing this file by any method?
Question 6 - are you using some sort of auto online backup system?
Along with John's suggestions and questions above; often when you back up a data file if you have the setting turned on, it adds the date after the data file name. If you then restore the backup to the new installation the name will be long again. What is the data file name now?
When an auto backup routine is in progress Reckon Accounts Personal will view that folder and all the files in it as in use by another programme and consequently not accessible to it.
You can test it by copying your RAP datafile folder to a C-drive location and access from that spot. Do you have the same problem when the auto backup is in progress?
Suggest you have your RAP files in a separate folder in C-drive. You will need to get in the habit of making regular backups again. Save the backup to another folder on your C-drive and then use File Explorer commands to copy the backup to your My Docs for your auto backup to pick it up.
The IDX file is not an issue - there are a number of auxiliary files RAP creates as needed. The only additional file you need to protect its history is the QPH file which contains your share price history.
With File Explorer find your most recently dated datafile - .QDF extension - in your My Docs folder. Is it more recent than your last backup? Copy it and other file extensions with the same name (IDX, HCX, QPH, etc) to your new folder. Any problems opening it?