Details
By default STEP files (.stp and .step) are not associated to the Solid Edge application in Windows Explorer. Using 'Set your default programs' in Windows to associate STEP files with Edge.exe will result in launching multiple instances of Solid Edge instead of opening the STEP files into a single, already running instance of Solid Edge.
Solution
To force Windows Explorer to open STEP files from Windows Explorer into a single instance of Solid Edge, add the following registry keys:
[-HKEY_CURRENT_USER\Software\Classes\.stp]
[-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.stp]
[HKEY_CURRENT_USER\Software\Classes\.stp]
@="SolidEdge.PartDocument"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.stp]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.stp\OpenWithList]
"a"="Edge.exe"
"MRUList"="a"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.stp\OpenWithProgids]
"SolidEdge.PartDocument"=hex(0):
[-HKEY_CURRENT_USER\Software\Classes\.step]
[-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.step]
[HKEY_CURRENT_USER\Software\Classes\.step]
@="SolidEdge.PartDocument"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.step]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.step\OpenWithList]
"a"="Edge.exe"
"MRUList"="a"
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.step\OpenWithProgids]
"SolidEdge.PartDocument"=hex(0):
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 1064
Product: SOLID_EDGE
Application: APPLICATION
Version: V110.0
Function: OTHER
Ref: 002-8002018