The HD Remaster is one PC product but it contains several distinct save contexts, so backing up only the first save-looking file is risky. Steam places the collection under one Documents root; Microsoft Store uses WGS. SaveEditor recommends preserving the collection root and labeling the backup with which component game and slot were active. That matters when troubleshooting because Final Fantasy X, X-2, and Last Mission can each have their own progress while sharing the same installation and launcher.
Identify the exact save you intend to edit
The researched Final Fantasy X/X-2 HD Remaster PC save location is Windows: Steam: %USERPROFILE%DocumentsSQUARE ENIXFINAL FANTASY X&X-2 HD Remaster ; Microsoft Store: %LOCALAPPDATA%Packages39EA002F.FFXX-2HDRemaster_n746a19ndrrjgSystemAppDatawgs 009000000B904E5_0000000000000000000000006038DDC9<container>. Known file/folder pattern: Separate game-specific save data exists beneath the remaster root for Final Fantasy X, X-2, and Last Mission.. Storefront context: Steam, Microsoft Store. Do not assume a save from FFX belongs in the same subfolder as X-2 or Last Mission. Microsoft Store container names are not user-friendly filenames. Do not edit a similarly named file from a different profile, edition, or cloud cache.
Make an untouched backup first
Copy the whole FINAL FANTASY X&X-2 HD Remaster directory on Steam so all game-specific subfolders and system data remain together. For WGS, preserve the complete container tree. Keep that copy outside the live save directory and do not overwrite it with later experiments. Cloud context: Steam Cloud and Xbox Cloud are documented; OneDrive can also synchronize the Documents root when enabled. If a launcher can synchronize the save, prevent it from silently replacing either the original or edited copy while testing.
Understand the format boundary
The collection contains multiple games under one product. Steam uses the Documents tree while Microsoft Store uses a WGS container. Steam Cloud quotas are tracked separately for FFX, X-2, and Last Mission. File-extension context: No single extension is sufficient to identify every relevant save record. Compatibility note: A backup for one title in the collection should not overwrite another title’s data. Steam and Microsoft Store use different storage containers even when the underlying game progress is related. These facts help identify the save but do not automatically reveal every field, checksum, encryption rule, or version-specific structure inside it.
Use only a Tool whose claim matches the file
Generic viewers and diff tools can inspect bytes without claiming game-specific semantics. A game-specific editor should be used only when its Tool page explicitly lists Final Fantasy X/X-2 HD Remaster, a matching supported version/container, and a Verified operational runtime. A planned URL or Game Hub is not evidence that an editor exists.
Test the edited copy safely
Write to a new output file when the Tool supports it, keep the original backup, restore the edited copy into the correct profile/storefront location, and launch the game only after the file operation finishes. If the game rejects it, If a save appears absent, confirm whether you launched X, X-2, or Last Mission and whether OneDrive/Steam Cloud restored a different Documents copy. Microsoft Store users should verify the correct WGS account container. Return to the untouched backup before trying another change.
Verification context: Reviewed against current PCGamingWiki Final Fantasy X/X-2 HD Remaster save-location and cloud documentation.